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Foster ISO-B Series Couplers

Foster ISO-B (FHK) Series hydraulic quick couplers and plugs, compatible with ISO 7241-1 Series B — the most widely used industrial hydraulic interchange. Two-way shut-off seals both halves at disconnect to prevent fluid loss and air inclusion. Manual sleeve connection at zero pressure. Body sizes 1/8" to 1", in RoHS-plated steel, brass, and 303/316 stainless with Buna-N seals.

  • Foster FHS4M4B-103, 1/2" Snap-Tite H Interchange Coupler x 1/2" Male NPT, FH Series, EPDM Seal, Brass
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    $ 21.09
    $ 21.09 - $ 21.09
    $ 21.09
    $ 16.89
    $ 16.89 - $ 16.89
    $ 16.89

    Foster H1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Brass

    In stock

    Reliable, leak-free hydraulic connections built to the most widely used industrial standard. The Foster H1B is a brass 1/8" coupler from the ISO-B ...

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    $ 21.09
    $ 21.09 - $ 21.09
    $ 21.09
    $ 16.89
    $ 16.89 - $ 16.89
    $ 16.89
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  • Foster FHS4M4B-103, 1/2" Snap-Tite H Interchange Coupler x 1/2" Male NPT, FH Series, EPDM Seal, Brass
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    $ 28.09
    $ 28.09 - $ 28.09
    $ 28.09
    $ 22.49
    $ 22.49 - $ 22.49
    $ 22.49

    Foster H1B-101, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Viton Seal, Brass

    In stock

    Reliable, leak-free hydraulic connections built to the most widely used industrial standard. The Foster H1B-101 is a brass 1/8" coupler from the IS...

    View full details
    $ 28.09
    $ 28.09 - $ 28.09
    $ 28.09
    $ 22.49
    $ 22.49 - $ 22.49
    $ 22.49
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  • Foster FHS4M4B-103, 1/2" Snap-Tite H Interchange Coupler x 1/2" Male NPT, FH Series, EPDM Seal, Brass
    Save 20% Save %
    $ 27.89
    $ 27.89 - $ 27.89
    $ 27.89
    $ 22.29
    $ 22.29 - $ 22.29
    $ 22.29

    Foster H1B-103, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, EPDM Seal, Brass

    In stock

    Reliable, leak-free hydraulic connections built to the most widely used industrial standard. The Foster H1B-103 is a brass 1/8" coupler from the IS...

    View full details
    $ 27.89
    $ 27.89 - $ 27.89
    $ 27.89
    $ 22.29
    $ 22.29 - $ 22.29
    $ 22.29
    Save 20% Save %
  • Foster FHS4M4B-103, 1/2" Snap-Tite H Interchange Coupler x 1/2" Male NPT, FH Series, EPDM Seal, Brass
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    $ 22.39
    $ 22.39 - $ 22.39
    $ 22.39
    $ 17.89
    $ 17.89 - $ 17.89
    $ 17.89

    Foster H1BLV, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Less Valve, Brass

    In stock

    Reliable, leak-free hydraulic connections built to the most widely used industrial standard. The Foster H1BLV is a brass 1/8" coupler from the ISO-...

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    $ 22.39
    $ 22.39 - $ 22.39
    $ 22.39
    $ 17.89
    $ 17.89 - $ 17.89
    $ 17.89
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  • Foster FHS4M4B-103, 1/2" Snap-Tite H Interchange Coupler x 1/2" Male NPT, FH Series, EPDM Seal, Brass
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    $ 22.69
    $ 22.69 - $ 22.69
    $ 22.69
    $ 18.19
    $ 18.19 - $ 18.19
    $ 18.19

    Foster H1S, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Plated Steel

    In stock

    Reliable, leak-free hydraulic connections built to the most widely used industrial standard. The Foster H1S is a plated steel 1/8" coupler from the...

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    $ 22.69
    $ 22.69 - $ 22.69
    $ 22.69
    $ 18.19
    $ 18.19 - $ 18.19
    $ 18.19
    Save 20% Save %
  • Foster FHS4M4B-103, 1/2" Snap-Tite H Interchange Coupler x 1/2" Male NPT, FH Series, EPDM Seal, Brass
    Save 20% Save %
    $ 27.79
    $ 27.79 - $ 27.79
    $ 27.79
    $ 22.19
    $ 22.19 - $ 22.19
    $ 22.19

    Foster H1S-101, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Viton Seal, Plated Steel

    In stock

    Reliable, leak-free hydraulic connections built to the most widely used industrial standard. The Foster H1S-101 is a plated steel 1/8" coupler from...

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    $ 27.79
    $ 27.79 - $ 27.79
    $ 27.79
    $ 22.19
    $ 22.19 - $ 22.19
    $ 22.19
    Save 20% Save %
  • Foster FHS4M4B-103, 1/2" Snap-Tite H Interchange Coupler x 1/2" Male NPT, FH Series, EPDM Seal, Brass
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    $ 66.89
    $ 66.89 - $ 66.89
    $ 66.89
    $ 53.49
    $ 53.49 - $ 53.49
    $ 53.49

    Foster H1S/S, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, 303 Stainless Steel

    In stock

    Reliable, leak-free hydraulic connections built to the most widely used industrial standard. The Foster H1S/S is a 303 stainless steel 1/8" coupler...

    View full details
    $ 66.89
    $ 66.89 - $ 66.89
    $ 66.89
    $ 53.49
    $ 53.49 - $ 53.49
    $ 53.49
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  • Foster FHS4M4B-103, 1/2" Snap-Tite H Interchange Coupler x 1/2" Male NPT, FH Series, EPDM Seal, Brass
    Save 20% Save %
    $ 72.49
    $ 72.49 - $ 72.49
    $ 72.49
    $ 57.99
    $ 57.99 - $ 57.99
    $ 57.99

    Foster H1S/S-101, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Viton Seal, 303 Stainless Steel

    In stock

    Reliable, leak-free hydraulic connections built to the most widely used industrial standard. The Foster H1S/S-101 is a 303 stainless steel 1/8" cou...

    View full details
    $ 72.49
    $ 72.49 - $ 72.49
    $ 72.49
    $ 57.99
    $ 57.99 - $ 57.99
    $ 57.99
    Save 20% Save %
  • Foster FHS4M4B-103, 1/2" Snap-Tite H Interchange Coupler x 1/2" Male NPT, FH Series, EPDM Seal, Brass
    Save 20% Save %
    $ 72.89
    $ 72.89 - $ 72.89
    $ 72.89
    $ 58.29
    $ 58.29 - $ 58.29
    $ 58.29

    Foster H1S/S-104, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Silicone Seal, 303 Stainless Steel

    In stock

    Reliable, leak-free hydraulic connections built to the most widely used industrial standard. The Foster H1S/S-104 is a 303 stainless steel 1/8" cou...

    View full details
    $ 72.89
    $ 72.89 - $ 72.89
    $ 72.89
    $ 58.29
    $ 58.29 - $ 58.29
    $ 58.29
    Save 20% Save %
  • Foster FHS4M4B-103, 1/2" Snap-Tite H Interchange Coupler x 1/2" Male NPT, FH Series, EPDM Seal, Brass
    Save 20% Save %
    $ 28.19
    $ 28.19 - $ 28.19
    $ 28.19
    $ 22.59
    $ 22.59 - $ 22.59
    $ 22.59

    Foster H1S4, 1/8" ISO-B Hydraulic Coupler x 7/16"-20 SAE, ISO-B Series, Plated Steel

    In stock

    Reliable, leak-free hydraulic connections built to the most widely used industrial standard. The Foster H1S4 is a plated steel 1/8" coupler from th...

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    $ 28.19
    $ 28.19 - $ 28.19
    $ 28.19
    $ 22.59
    $ 22.59 - $ 22.59
    $ 22.59
    Save 20% Save %
  • Foster FHS4M4B-103, 1/2" Snap-Tite H Interchange Coupler x 1/2" Male NPT, FH Series, EPDM Seal, Brass
    Save 20% Save %
    $ 26.49
    $ 26.49 - $ 26.49
    $ 26.49
    $ 21.19
    $ 21.19 - $ 21.19
    $ 21.19

    Foster H2B, 1/4" ISO-B Hydraulic Coupler x 1/4" Female NPT, ISO-B Series, Brass

    In stock

    Reliable, leak-free hydraulic connections built to the most widely used industrial standard. The Foster H2B is a brass 1/4" coupler from the ISO-B ...

    View full details
    $ 26.49
    $ 26.49 - $ 26.49
    $ 26.49
    $ 21.19
    $ 21.19 - $ 21.19
    $ 21.19
    Save 20% Save %
  • Foster FHS4M4B-103, 1/2" Snap-Tite H Interchange Coupler x 1/2" Male NPT, FH Series, EPDM Seal, Brass
    Save 20% Save %
    $ 31.49
    $ 31.49 - $ 31.49
    $ 31.49
    $ 25.19
    $ 25.19 - $ 25.19
    $ 25.19

    Foster H2B-101, 1/4" ISO-B Hydraulic Coupler x 1/4" Female NPT, ISO-B Series, Viton Seal, Brass

    In stock

    Reliable, leak-free hydraulic connections built to the most widely used industrial standard. The Foster H2B-101 is a brass 1/4" coupler from the IS...

    View full details
    $ 31.49
    $ 31.49 - $ 31.49
    $ 31.49
    $ 25.19
    $ 25.19 - $ 25.19
    $ 25.19
    Save 20% Save %
  • Foster FHS4M4B-103, 1/2" Snap-Tite H Interchange Coupler x 1/2" Male NPT, FH Series, EPDM Seal, Brass
    Save 20% Save %
    $ 33.09
    $ 33.09 - $ 33.09
    $ 33.09
    $ 26.49
    $ 26.49 - $ 26.49
    $ 26.49

    Foster H2B-102, 1/4" ISO-B Hydraulic Coupler x 1/4" Female NPT, ISO-B Series, Neoprene Seal, Brass

    In stock

    Reliable, leak-free hydraulic connections built to the most widely used industrial standard. The Foster H2B-102 is a brass 1/4" coupler from the IS...

    View full details
    $ 33.09
    $ 33.09 - $ 33.09
    $ 33.09
    $ 26.49
    $ 26.49 - $ 26.49
    $ 26.49
    Save 20% Save %
  • Foster FHS4M4B-103, 1/2" Snap-Tite H Interchange Coupler x 1/2" Male NPT, FH Series, EPDM Seal, Brass
    Save 20% Save %
    $ 32.99
    $ 32.99 - $ 32.99
    $ 32.99
    $ 26.39
    $ 26.39 - $ 26.39
    $ 26.39

    Foster H2B-103, 1/4" ISO-B Hydraulic Coupler x 1/4" Female NPT, ISO-B Series, EPDM Seal, Brass

    In stock

    Reliable, leak-free hydraulic connections built to the most widely used industrial standard. The Foster H2B-103 is a brass 1/4" coupler from the IS...

    View full details
    $ 32.99
    $ 32.99 - $ 32.99
    $ 32.99
    $ 26.39
    $ 26.39 - $ 26.39
    $ 26.39
    Save 20% Save %
  • Foster FHS4M4B-103, 1/2" Snap-Tite H Interchange Coupler x 1/2" Male NPT, FH Series, EPDM Seal, Brass
    Save 20% Save %
    $ 26.99
    $ 26.99 - $ 26.99
    $ 26.99
    $ 21.59
    $ 21.59 - $ 21.59
    $ 21.59

    Foster H2BLV, 1/4" ISO-B Hydraulic Coupler x 1/4" Female NPT, ISO-B Series, Less Valve, Brass

    In stock

    Reliable, leak-free hydraulic connections built to the most widely used industrial standard. The Foster H2BLV is a brass 1/4" coupler from the ISO-...

    View full details
    $ 26.99
    $ 26.99 - $ 26.99
    $ 26.99
    $ 21.59
    $ 21.59 - $ 21.59
    $ 21.59
    Save 20% Save %
  • Foster FHS4M4B-103, 1/2" Snap-Tite H Interchange Coupler x 1/2" Male NPT, FH Series, EPDM Seal, Brass
    Save 20% Save %
    $ 24.59
    $ 24.59 - $ 24.59
    $ 24.59
    $ 19.69
    $ 19.69 - $ 19.69
    $ 19.69

    Foster H2S, 1/4" ISO-B Hydraulic Coupler x 1/4" Female NPT, ISO-B Series, Plated Steel

    In stock

    Reliable, leak-free hydraulic connections built to the most widely used industrial standard. The Foster H2S is a plated steel 1/4" coupler from the...

    View full details
    $ 24.59
    $ 24.59 - $ 24.59
    $ 24.59
    $ 19.69
    $ 19.69 - $ 19.69
    $ 19.69
    Save 20% Save %
  • Foster FHS4M4B-103, 1/2" Snap-Tite H Interchange Coupler x 1/2" Male NPT, FH Series, EPDM Seal, Brass
    Save 20% Save %
    $ 28.59
    $ 28.59 - $ 28.59
    $ 28.59
    $ 22.89
    $ 22.89 - $ 22.89
    $ 22.89

    Foster H2S-101, 1/4" ISO-B Hydraulic Coupler x 1/4" Female NPT, ISO-B Series, Viton Seal, Plated Steel

    In stock

    Reliable, leak-free hydraulic connections built to the most widely used industrial standard. The Foster H2S-101 is a plated steel 1/4" coupler from...

    View full details
    $ 28.59
    $ 28.59 - $ 28.59
    $ 28.59
    $ 22.89
    $ 22.89 - $ 22.89
    $ 22.89
    Save 20% Save %
  • Foster FHS4M4B-103, 1/2" Snap-Tite H Interchange Coupler x 1/2" Male NPT, FH Series, EPDM Seal, Brass
    Save 20% Save %
    $ 28.79
    $ 28.79 - $ 28.79
    $ 28.79
    $ 22.99
    $ 22.99 - $ 22.99
    $ 22.99

    Foster H2S-103, 1/4" ISO-B Hydraulic Coupler x 1/4" Female NPT, ISO-B Series, EPDM Seal, Plated Steel

    In stock

    Reliable, leak-free hydraulic connections built to the most widely used industrial standard. The Foster H2S-103 is a plated steel 1/4" coupler from...

    View full details
    $ 28.79
    $ 28.79 - $ 28.79
    $ 28.79
    $ 22.99
    $ 22.99 - $ 22.99
    $ 22.99
    Save 20% Save %
  • Foster FHS4M4B-103, 1/2" Snap-Tite H Interchange Coupler x 1/2" Male NPT, FH Series, EPDM Seal, Brass
    Save 20% Save %
    $ 29.49
    $ 29.49 - $ 29.49
    $ 29.49
    $ 23.59
    $ 23.59 - $ 23.59
    $ 23.59

    Foster H2S-104, 1/4" ISO-B Hydraulic Coupler x 1/4" Female NPT, ISO-B Series, Silicone Seal, Plated Steel

    In stock

    Reliable, leak-free hydraulic connections built to the most widely used industrial standard. The Foster H2S-104 is a plated steel 1/4" coupler from...

    View full details
    $ 29.49
    $ 29.49 - $ 29.49
    $ 29.49
    $ 23.59
    $ 23.59 - $ 23.59
    $ 23.59
    Save 20% Save %
  • Foster FHS4M4B-103, 1/2" Snap-Tite H Interchange Coupler x 1/2" Male NPT, FH Series, EPDM Seal, Brass
    Save 20% Save %
    $ 69.19
    $ 69.19 - $ 69.19
    $ 69.19
    $ 55.39
    $ 55.39 - $ 55.39
    $ 55.39

    Foster H2S/S, 1/4" ISO-B Hydraulic Coupler x 1/4" Female NPT, ISO-B Series, 303 Stainless Steel

    In stock

    Reliable, leak-free hydraulic connections built to the most widely used industrial standard. The Foster H2S/S is a 303 stainless steel 1/4" coupler...

    View full details
    $ 69.19
    $ 69.19 - $ 69.19
    $ 69.19
    $ 55.39
    $ 55.39 - $ 55.39
    $ 55.39
    Save 20% Save %
  • Foster FHS4M4B-103, 1/2" Snap-Tite H Interchange Coupler x 1/2" Male NPT, FH Series, EPDM Seal, Brass
    Save 20% Save %
    $ 71.79
    $ 71.79 - $ 71.79
    $ 71.79
    $ 57.39
    $ 57.39 - $ 57.39
    $ 57.39

    Foster H2S/S-101, 1/4" ISO-B Hydraulic Coupler x 1/4" Female NPT, ISO-B Series, Viton Seal, 303 Stainless Steel

    In stock

    Reliable, leak-free hydraulic connections built to the most widely used industrial standard. The Foster H2S/S-101 is a 303 stainless steel 1/4" cou...

    View full details
    $ 71.79
    $ 71.79 - $ 71.79
    $ 71.79
    $ 57.39
    $ 57.39 - $ 57.39
    $ 57.39
    Save 20% Save %
  • Foster FHS4M4B-103, 1/2" Snap-Tite H Interchange Coupler x 1/2" Male NPT, FH Series, EPDM Seal, Brass
    Save 20% Save %
    $ 73.29
    $ 73.29 - $ 73.29
    $ 73.29
    $ 58.69
    $ 58.69 - $ 58.69
    $ 58.69

    Foster H2S/S-103, 1/4" ISO-B Hydraulic Coupler x 1/4" Female NPT, ISO-B Series, EPDM Seal, 303 Stainless Steel

    In stock

    Reliable, leak-free hydraulic connections built to the most widely used industrial standard. The Foster H2S/S-103 is a 303 stainless steel 1/4" cou...

    View full details
    $ 73.29
    $ 73.29 - $ 73.29
    $ 73.29
    $ 58.69
    $ 58.69 - $ 58.69
    $ 58.69
    Save 20% Save %
  • Foster FHS4M4B-103, 1/2" Snap-Tite H Interchange Coupler x 1/2" Male NPT, FH Series, EPDM Seal, Brass
    Save 20% Save %
    $ 74.69
    $ 74.69 - $ 74.69
    $ 74.69
    $ 59.79
    $ 59.79 - $ 59.79
    $ 59.79

    Foster H2S/S-104, 1/4" ISO-B Hydraulic Coupler x 1/4" Female NPT, ISO-B Series, Silicone Seal, 303 Stainless Steel

    In stock

    Reliable, leak-free hydraulic connections built to the most widely used industrial standard. The Foster H2S/S-104 is a 303 stainless steel 1/4" cou...

    View full details
    $ 74.69
    $ 74.69 - $ 74.69
    $ 74.69
    $ 59.79
    $ 59.79 - $ 59.79
    $ 59.79
    Save 20% Save %
  • Foster FHS4M4B-103, 1/2" Snap-Tite H Interchange Coupler x 1/2" Male NPT, FH Series, EPDM Seal, Brass
    Save 20% Save %
    $ 69.19
    $ 69.19 - $ 69.19
    $ 69.19
    $ 55.39
    $ 55.39 - $ 55.39
    $ 55.39

    Foster H2S/SLV, 1/4" ISO-B Hydraulic Coupler x 1/4" Female NPT, ISO-B Series, Less Valve, 303 Stainless Steel

    In stock

    Reliable, leak-free hydraulic connections built to the most widely used industrial standard. The Foster H2S/SLV is a 303 stainless steel 1/4" coupl...

    View full details
    $ 69.19
    $ 69.19 - $ 69.19
    $ 69.19
    $ 55.39
    $ 55.39 - $ 55.39
    $ 55.39
    Save 20% Save %