Skip to content
☀️ Take an Additional 10% Off Your Entire Order with code GEARUP10 at checkout.
☀️ Additional 10% Off • GEARUP10

Foster 5 Series Couplers

The Foster 5 Series is the 1/2" body industrial interchange, a high-flow air coupler size for shop and industrial systems. This collection includes 5 Series couplers and plugs in brass, steel, and stainless with NPT, hose barb, push-on, and reusable terminations. Filter by thread, material, and coupler or plug to match your line.

Filters

Save 20% Save %
$ 12.19
$ 12.19 - $ 12.19
$ 12.19
$ 9.79
$ 9.79 - $ 9.79
$ 9.79

Foster 60-5B, 5 Series, Industrial Plug, 1/2" Hose Barb, Brass

Reliable, leak-free 1/2" connections for high-flow air and fluid lines. The Foster 60-5B is a Brass 1/2" industrial plug from the Foster 5 Series —...

View full details
$ 12.19
$ 12.19 - $ 12.19
$ 12.19
$ 9.79
$ 9.79 - $ 9.79
$ 9.79
Save 20% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass Save 20% Save %
$ 14.49
$ 14.49 - $ 14.49
$ 14.49
$ 11.59
$ 11.59 - $ 11.59
$ 11.59

Foster 60-5G, 1/2" Industrial Plug x 1/2" Hose ID, 5 Series, Ball Check, Steel

Reliable, leak-free 1/2" connections for high-flow air and fluid lines. The Foster 60-5G is a Steel 1/2" industrial plug from the Foster 5 Series —...

View full details
$ 14.49
$ 14.49 - $ 14.49
$ 14.49
$ 11.59
$ 11.59 - $ 11.59
$ 11.59
Save 20% Save %
Save 20% Save %
$ 14.49
$ 14.49 - $ 14.49
$ 14.49
$ 11.59
$ 11.59 - $ 11.59
$ 11.59

Foster 60-5G, 5 Series, Industrial Plug, Ball Check, 1/2" Hose Barb, Steel

Reliable, leak-free 1/2" connections for high-flow air and fluid lines. The Foster 60-5G is a Steel 1/2" industrial plug from the Foster 5 Series —...

View full details
$ 14.49
$ 14.49 - $ 14.49
$ 14.49
$ 11.59
$ 11.59 - $ 11.59
$ 11.59
Save 20% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass Save 20% Save %
$ 14.89
$ 14.89 - $ 14.89
$ 14.89
$ 11.89
$ 11.89 - $ 11.89
$ 11.89

Foster 61-5, 1/2" Industrial Plug x 3/4" Hose ID, 5 Series, Steel

Reliable, leak-free 1/2" connections for high-flow air and fluid lines. The Foster 61-5 is a Steel 1/2" industrial plug from the Foster 5 Series — ...

View full details
$ 14.89
$ 14.89 - $ 14.89
$ 14.89
$ 11.89
$ 11.89 - $ 11.89
$ 11.89
Save 20% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
Save 20% Save %
$ 19.79
$ 19.79 - $ 19.79
$ 19.79
$ 15.79
$ 15.79 - $ 15.79
$ 15.79

Foster 61-5B, 1/2" Industrial Plug x 3/4" Hose ID, 5 Series, Brass

Reliable, leak-free 1/2" connections for high-flow air and fluid lines. The Foster 61-5B is a Brass 1/2" industrial plug from the Foster 5 Series —...

View full details
$ 19.79
$ 19.79 - $ 19.79
$ 19.79
$ 15.79
$ 15.79 - $ 15.79
$ 15.79
Save 20% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
Save 20% Save %
$ 10.99
$ 10.99 - $ 10.99
$ 10.99
$ 8.79
$ 8.79 - $ 8.79
$ 8.79

Foster 71-5, 1/2" Industrial Plug x 3/8" Push-On Hose Stem, 5 Series, Steel

Reliable, leak-free 1/2" connections for high-flow air and fluid lines. The Foster 71-5 is a Steel 1/2" industrial plug from the Foster 5 Series — ...

View full details
$ 10.99
$ 10.99 - $ 10.99
$ 10.99
$ 8.79
$ 8.79 - $ 8.79
$ 8.79
Save 20% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
Save 20% Save %
$ 10.29
$ 10.29 - $ 10.29
$ 10.29
$ 8.19
$ 8.19 - $ 8.19
$ 8.19

Foster 81-5, 1/2" Industrial Plug x 1/2" Push-On Hose Stem, 5 Series, Steel

Reliable, leak-free 1/2" connections for high-flow air and fluid lines. The Foster 81-5 is a Steel 1/2" industrial plug from the Foster 5 Series — ...

View full details
$ 10.29
$ 10.29 - $ 10.29
$ 10.29
$ 8.19
$ 8.19 - $ 8.19
$ 8.19
Save 20% Save %
Save 20% Save %
$ 10.29
$ 10.29 - $ 10.29
$ 10.29
$ 8.19
$ 8.19 - $ 8.19
$ 8.19

Foster 81-5, 5 Series, Industrial Plug, 1/2" Hose Barb, Steel

Reliable, leak-free 1/2" connections for high-flow air and fluid lines. The Foster 81-5 is a Steel 1/2" industrial plug from the Foster 5 Series — ...

View full details
$ 10.29
$ 10.29 - $ 10.29
$ 10.29
$ 8.19
$ 8.19 - $ 8.19
$ 8.19
Save 20% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
Save 20% Save %
$ 29.19
$ 29.19 - $ 29.19
$ 29.19
$ 23.39
$ 23.39 - $ 23.39
$ 23.39

Foster 81-5B, 1/2" Industrial Plug x 1/2" Push-On Hose Stem, 5 Series, Brass

Reliable, leak-free 1/2" connections for high-flow air and fluid lines. The Foster 81-5B is a Brass 1/2" industrial plug from the Foster 5 Series —...

View full details
$ 29.19
$ 29.19 - $ 29.19
$ 29.19
$ 23.39
$ 23.39 - $ 23.39
$ 23.39
Save 20% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
Save 20% Save %
$ 36.09
$ 36.09 - $ 36.09
$ 36.09
$ 28.89
$ 28.89 - $ 28.89
$ 28.89

Foster BL1815, 1/2" Industrial Coupler x 1/2" Push-On Hose Stem, 5 Series, Ball Lock, Brass/Steel

Reliable, leak-free 1/2" connections for high-flow air and fluid lines. The Foster BL1815 is a Brass/Steel 1/2" industrial coupler from the Foster ...

View full details
$ 36.09
$ 36.09 - $ 36.09
$ 36.09
$ 28.89
$ 28.89 - $ 28.89
$ 28.89
Save 20% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
Save 20% Save %
$ 39.69
$ 39.69 - $ 39.69
$ 39.69
$ 31.69
$ 31.69 - $ 31.69
$ 31.69

Foster BL4015, 1/2" Industrial Coupler x 1/4" Female NPT, 5 Series, Ball Lock, Brass/Steel

Reliable, leak-free 1/2" connections for high-flow air and fluid lines. The Foster BL4015 is a Brass/Steel 1/2" industrial coupler from the Foster ...

View full details
$ 39.69
$ 39.69 - $ 39.69
$ 39.69
$ 31.69
$ 31.69 - $ 31.69
$ 31.69
Save 20% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
Save 20% Save %
$ 39.69
$ 39.69 - $ 39.69
$ 39.69
$ 31.69
$ 31.69 - $ 31.69
$ 31.69

Foster BL4905, 1/2" Industrial Coupler x 1/4" Male NPT, 5 Series, Ball Lock, Brass/Steel

Reliable, leak-free 1/2" connections for high-flow air and fluid lines. The Foster BL4905 is a Brass/Steel 1/2" industrial coupler from the Foster ...

View full details
$ 39.69
$ 39.69 - $ 39.69
$ 39.69
$ 31.69
$ 31.69 - $ 31.69
$ 31.69
Save 20% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
Save 20% Save %
$ 35.99
$ 35.99 - $ 35.99
$ 35.99
$ 28.79
$ 28.79 - $ 28.79
$ 28.79

Foster BL5005, 1/2" Industrial Coupler x 3/8" Female NPT, 5 Series, Ball Lock, Brass/Steel

Reliable, leak-free 1/2" connections for high-flow air and fluid lines. The Foster BL5005 is a Brass/Steel 1/2" industrial coupler from the Foster ...

View full details
$ 35.99
$ 35.99 - $ 35.99
$ 35.99
$ 28.79
$ 28.79 - $ 28.79
$ 28.79
Save 20% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
Save 20% Save %
$ 35.99
$ 35.99 - $ 35.99
$ 35.99
$ 28.79
$ 28.79 - $ 28.79
$ 28.79

Foster BL5105, 1/2" Industrial Coupler x 3/8" Male NPT, 5 Series, Ball Lock, Brass/Steel

Reliable, leak-free 1/2" connections for high-flow air and fluid lines. The Foster BL5105 is a Brass/Steel 1/2" industrial coupler from the Foster ...

View full details
$ 35.99
$ 35.99 - $ 35.99
$ 35.99
$ 28.79
$ 28.79 - $ 28.79
$ 28.79
Save 20% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
Save 20% Save %
$ 36.39
$ 36.39 - $ 36.39
$ 36.39
$ 29.09
$ 29.09 - $ 29.09
$ 29.09

Foster BL5205, 1/2" Industrial Coupler x 1/2" Female NPT, 5 Series, Ball Lock, Brass/Steel

Reliable, leak-free 1/2" connections for high-flow air and fluid lines. The Foster BL5205 is a Brass/Steel 1/2" industrial coupler from the Foster ...

View full details
$ 36.39
$ 36.39 - $ 36.39
$ 36.39
$ 29.09
$ 29.09 - $ 29.09
$ 29.09
Save 20% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
Save 20% Save %
$ 36.39
$ 36.39 - $ 36.39
$ 36.39
$ 29.09
$ 29.09 - $ 29.09
$ 29.09

Foster BL5305, 1/2" Industrial Coupler x 1/2" Male NPT, 5 Series, Ball Lock, Brass/Steel

Reliable, leak-free 1/2" connections for high-flow air and fluid lines. The Foster BL5305 is a Brass/Steel 1/2" industrial coupler from the Foster ...

View full details
$ 36.39
$ 36.39 - $ 36.39
$ 36.39
$ 29.09
$ 29.09 - $ 29.09
$ 29.09
Save 20% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
Save 20% Save %
$ 36.79
$ 36.79 - $ 36.79
$ 36.79
$ 29.39
$ 29.39 - $ 29.39
$ 29.39

Foster BL5405, 1/2" Industrial Coupler x 3/4" Female NPT, 5 Series, Ball Lock, Brass/Steel

Reliable, leak-free 1/2" connections for high-flow air and fluid lines. The Foster BL5405 is a Brass/Steel 1/2" industrial coupler from the Foster ...

View full details
$ 36.79
$ 36.79 - $ 36.79
$ 36.79
$ 29.39
$ 29.39 - $ 29.39
$ 29.39
Save 20% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
Save 20% Save %
$ 36.79
$ 36.79 - $ 36.79
$ 36.79
$ 29.39
$ 29.39 - $ 29.39
$ 29.39

Foster BL5505, 1/2" Industrial Coupler x 3/4" Male NPT, 5 Series, Ball Lock, Brass/Steel

Reliable, leak-free 1/2" connections for high-flow air and fluid lines. The Foster BL5505 is a Brass/Steel 1/2" industrial coupler from the Foster ...

View full details
$ 36.79
$ 36.79 - $ 36.79
$ 36.79
$ 29.39
$ 29.39 - $ 29.39
$ 29.39
Save 20% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
Save 20% Save %
$ 40.09
$ 40.09 - $ 40.09
$ 40.09
$ 32.09
$ 32.09 - $ 32.09
$ 32.09

Foster BL5605, 1/2" Industrial Coupler x 1/4" Hose ID, 5 Series, Ball Lock, Brass/Steel

Reliable, leak-free 1/2" connections for high-flow air and fluid lines. The Foster BL5605 is a Brass/Steel 1/2" industrial coupler from the Foster ...

View full details
$ 40.09
$ 40.09 - $ 40.09
$ 40.09
$ 32.09
$ 32.09 - $ 32.09
$ 32.09
Save 20% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
Save 20% Save %
$ 38.79
$ 38.79 - $ 38.79
$ 38.79
$ 30.99
$ 30.99 - $ 30.99
$ 30.99

Foster BL5705, 1/2" Industrial Coupler x 3/8" Hose ID, 5 Series, Ball Lock, Brass/Steel

Reliable, leak-free 1/2" connections for high-flow air and fluid lines. The Foster BL5705 is a Brass/Steel 1/2" industrial coupler from the Foster ...

View full details
$ 38.79
$ 38.79 - $ 38.79
$ 38.79
$ 30.99
$ 30.99 - $ 30.99
$ 30.99
Save 20% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
Save 20% Save %
$ 38.99
$ 38.99 - $ 38.99
$ 38.99
$ 31.19
$ 31.19 - $ 31.19
$ 31.19

Foster BL5805, 1/2" Industrial Coupler x 1/2" Hose ID, 5 Series, Ball Lock, Brass/Steel

Reliable, leak-free 1/2" connections for high-flow air and fluid lines. The Foster BL5805 is a Brass/Steel 1/2" industrial coupler from the Foster ...

View full details
$ 38.99
$ 38.99 - $ 38.99
$ 38.99
$ 31.19
$ 31.19 - $ 31.19
$ 31.19
Save 20% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
Save 20% Save %
$ 39.39
$ 39.39 - $ 39.39
$ 39.39
$ 31.49
$ 31.49 - $ 31.49
$ 31.49

Foster BL5905, 1/2" Industrial Coupler x 3/4" Hose ID, 5 Series, Ball Lock, Brass/Steel

Reliable, leak-free 1/2" connections for high-flow air and fluid lines. The Foster BL5905 is a Brass/Steel 1/2" industrial coupler from the Foster ...

View full details
$ 39.39
$ 39.39 - $ 39.39
$ 39.39
$ 31.49
$ 31.49 - $ 31.49
$ 31.49
Save 20% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
Save 20% Save %
$ 42.79
$ 42.79 - $ 42.79
$ 42.79
$ 34.19
$ 34.19 - $ 34.19
$ 34.19

Foster BLSD11-5, 1/2" Industrial Coupler x Reusable Hose Fitting, 3/8" ID x 3/4" OD, 5 Series, Ball Lock, Brass/Steel

Reliable, leak-free 1/2" connections for high-flow air and fluid lines. The Foster BLSD11-5 is a Brass/Steel 1/2" industrial coupler from the Foste...

View full details
$ 42.79
$ 42.79 - $ 42.79
$ 42.79
$ 34.19
$ 34.19 - $ 34.19
$ 34.19
Save 20% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
Save 20% Save %
$ 43.99
$ 43.99 - $ 43.99
$ 43.99
$ 35.19
$ 35.19 - $ 35.19
$ 35.19

Foster BLSD9-5, 1/2" Industrial Coupler x Reusable Hose Fitting, 3/8" ID x 11/16" OD, 5 Series, Ball Lock, Brass/Steel

Reliable, leak-free 1/2" connections for high-flow air and fluid lines. The Foster BLSD9-5 is a Brass/Steel 1/2" industrial coupler from the Foster...

View full details
$ 43.99
$ 43.99 - $ 43.99
$ 43.99
$ 35.19
$ 35.19 - $ 35.19
$ 35.19
Save 20% Save %

Request a Quote

Bulk and dealer pricing. Tell us what you need and we’ll reply within one business day.