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Foster FST Series Couplers (Straight-Thru)

Foster FST Series full-flow straight-through hydraulic couplers and plugs — no valve in either half, so the inside diameter matches the nominal pipe for maximum flow. Standard Industrial Interchange with manual sleeve connection, body sizes 1/8" to 1-1/2". Brass, steel, and 303 stainless; ball-lock option available. Note: lines do not self-seal on disconnect.

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Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass Save 20% Save %
$ 213.00
$ 213.00 - $ 213.00
$ 213.00
$ 170.00
$ 170.00 - $ 170.00
$ 170.00

Foster 75FP, 3/4" Straight-Thru Plug x 3/4" Female NPT, FST Series, Steel

Maximum flow with no restriction, for air and fluid lines where shut-off is handled elsewhere. The Foster 75FP is a steel 3/4" straight-thru plug i...

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$ 213.00
$ 213.00 - $ 213.00
$ 213.00
$ 170.00
$ 170.00 - $ 170.00
$ 170.00
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Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass Save 20% Save %
$ 265.00
$ 265.00 - $ 265.00
$ 265.00
$ 213.00
$ 213.00 - $ 213.00
$ 213.00

Foster 75FPB, 3/4" Straight-Thru Plug x 3/4" Female NPT, FST Series, Brass

Maximum flow with no restriction, for air and fluid lines where shut-off is handled elsewhere. The Foster 75FPB is a brass 3/4" straight-thru plug ...

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$ 265.00
$ 265.00 - $ 265.00
$ 265.00
$ 213.00
$ 213.00 - $ 213.00
$ 213.00
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Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass Save 20% Save %
$ 851.00
$ 851.00 - $ 851.00
$ 851.00
$ 679.00
$ 679.00 - $ 679.00
$ 679.00

Foster 75FPS, 3/4" Straight-Thru Plug x 3/4" Female NPT, FST Series, 303 Stainless Steel

Maximum flow with no restriction, for air and fluid lines where shut-off is handled elsewhere. The Foster 75FPS is a 303 stainless 3/4" straight-th...

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$ 851.00
$ 851.00 - $ 851.00
$ 851.00
$ 679.00
$ 679.00 - $ 679.00
$ 679.00
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Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass Save 20% Save %
$ 616.00
$ 616.00 - $ 616.00
$ 616.00
$ 493.00
$ 493.00 - $ 493.00
$ 493.00

Foster 75FS, 3/4" Straight-Thru Coupler x 3/4" Female NPT, FST Series, Brass

Maximum flow with no restriction, for air and fluid lines where shut-off is handled elsewhere. The Foster 75FS is a brass 3/4" straight-thru couple...

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$ 616.00
$ 616.00 - $ 616.00
$ 616.00
$ 493.00
$ 493.00 - $ 493.00
$ 493.00
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Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
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$ 698.00
$ 698.00 - $ 698.00
$ 698.00
$ 559.00
$ 559.00 - $ 559.00
$ 559.00

Foster 75FS-101, 3/4" Straight-Thru Coupler x 3/4" Female NPT, FST Series, Viton Seal, Brass

Maximum flow with no restriction, for air and fluid lines where shut-off is handled elsewhere. The Foster 75FS-101 is a brass 3/4" straight-thru co...

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$ 698.00
$ 698.00 - $ 698.00
$ 698.00
$ 559.00
$ 559.00 - $ 559.00
$ 559.00
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Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
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$ 686.00
$ 686.00 - $ 686.00
$ 686.00
$ 550.00
$ 550.00 - $ 550.00
$ 550.00

Foster 75FS-103, 3/4" Straight-Thru Coupler x 3/4" Female NPT, FST Series, EPDM Seal, Brass

Maximum flow with no restriction, for air and fluid lines where shut-off is handled elsewhere. The Foster 75FS-103 is a brass 3/4" straight-thru co...

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$ 686.00
$ 686.00 - $ 686.00
$ 686.00
$ 550.00
$ 550.00 - $ 550.00
$ 550.00
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Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
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$ 714.00
$ 714.00 - $ 714.00
$ 714.00
$ 572.00
$ 572.00 - $ 572.00
$ 572.00

Foster 75FS-104, 3/4" Straight-Thru Coupler x 3/4" Female NPT, FST Series, Silicone Seal, Brass

Maximum flow with no restriction, for air and fluid lines where shut-off is handled elsewhere. The Foster 75FS-104 is a brass 3/4" straight-thru co...

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$ 714.00
$ 714.00 - $ 714.00
$ 714.00
$ 572.00
$ 572.00 - $ 572.00
$ 572.00
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Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
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$ 2,022.00
$ 2,022.00 - $ 2,022.00
$ 2,022.00
$ 1,618.00
$ 1,618.00 - $ 1,618.00
$ 1,618.00

Foster 75FSS, 3/4" Straight-Thru Coupler x 3/4" Female NPT, FST Series, 303 Stainless Steel

Maximum flow with no restriction, for air and fluid lines where shut-off is handled elsewhere. The Foster 75FSS is a 303 stainless 3/4" straight-th...

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$ 2,022.00
$ 2,022.00 - $ 2,022.00
$ 2,022.00
$ 1,618.00
$ 1,618.00 - $ 1,618.00
$ 1,618.00
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Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
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$ 2,086.00
$ 2,086.00 - $ 2,086.00
$ 2,086.00
$ 1,668.00
$ 1,668.00 - $ 1,668.00
$ 1,668.00

Foster 75FSS-101, 3/4" Straight-Thru Coupler x 3/4" Female NPT, FST Series, Viton Seal, 303 Stainless Steel

Maximum flow with no restriction, for air and fluid lines where shut-off is handled elsewhere. The Foster 75FSS-101 is a 303 stainless 3/4" straigh...

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$ 2,086.00
$ 2,086.00 - $ 2,086.00
$ 2,086.00
$ 1,668.00
$ 1,668.00 - $ 1,668.00
$ 1,668.00
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Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
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$ 2,117.00
$ 2,117.00 - $ 2,117.00
$ 2,117.00
$ 1,694.00
$ 1,694.00 - $ 1,694.00
$ 1,694.00

Foster 75FSS-103, 3/4" Straight-Thru Coupler x 3/4" Female NPT, FST Series, EPDM Seal, 303 Stainless Steel

Maximum flow with no restriction, for air and fluid lines where shut-off is handled elsewhere. The Foster 75FSS-103 is a 303 stainless 3/4" straigh...

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$ 2,117.00
$ 2,117.00 - $ 2,117.00
$ 2,117.00
$ 1,694.00
$ 1,694.00 - $ 1,694.00
$ 1,694.00
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Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
Save 20% Save %
$ 301.00
$ 301.00 - $ 301.00
$ 301.00
$ 241.00
$ 241.00 - $ 241.00
$ 241.00

Foster 75HPB, 3/4" Straight-Thru Plug x 3/4" Hose ID, FST Series, Brass

Maximum flow with no restriction, for air and fluid lines where shut-off is handled elsewhere. The Foster 75HPB is a brass 3/4" straight-thru plug ...

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$ 301.00
$ 301.00 - $ 301.00
$ 301.00
$ 241.00
$ 241.00 - $ 241.00
$ 241.00
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Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
Save 20% Save %
$ 1,120.00
$ 1,120.00 - $ 1,120.00
$ 1,120.00
$ 896.00
$ 896.00 - $ 896.00
$ 896.00

Foster BL100FS, 1" Straight-Thru Coupler x 1" Female NPT, FST Series, Ball Lock, Brass

Maximum flow with no restriction, for air and fluid lines where shut-off is handled elsewhere. The Foster BL100FS is a brass 1" straight-thru coupl...

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$ 1,120.00
$ 1,120.00 - $ 1,120.00
$ 1,120.00
$ 896.00
$ 896.00 - $ 896.00
$ 896.00
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Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
Save 20% Save %
$ 3,263.00
$ 3,263.00 - $ 3,263.00
$ 3,263.00
$ 2,610.00
$ 2,610.00 - $ 2,610.00
$ 2,610.00

Foster BL100FSS, 1" Straight-Thru Coupler x 1" Female NPT, FST Series, Ball Lock, 303 Stainless Steel

Maximum flow with no restriction, for air and fluid lines where shut-off is handled elsewhere. The Foster BL100FSS is a 303 stainless 1" straight-t...

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$ 3,263.00
$ 3,263.00 - $ 3,263.00
$ 3,263.00
$ 2,610.00
$ 2,610.00 - $ 2,610.00
$ 2,610.00
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 %
$ 3,000.00
$ 3,000.00 - $ 3,000.00
$ 3,000.00
$ 2,401.00
$ 2,401.00 - $ 2,401.00
$ 2,401.00

Foster BL125FS, 1-1/4" Straight-Thru Coupler x 1-1/4" Female NPT, FST Series, Ball Lock, Brass

Maximum flow with no restriction, for air and fluid lines where shut-off is handled elsewhere. The Foster BL125FS is a brass 1-1/4" straight-thru c...

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$ 3,000.00
$ 3,000.00 - $ 3,000.00
$ 3,000.00
$ 2,401.00
$ 2,401.00 - $ 2,401.00
$ 2,401.00
Save 20% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
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$ 320.00
$ 320.00 - $ 320.00
$ 320.00
$ 256.00
$ 256.00 - $ 256.00
$ 256.00

Foster BL12FS, 1/8" Straight-Thru Coupler x 1/8" Female NPT, FST Series, Ball Lock, Brass

Maximum flow with no restriction, for air and fluid lines where shut-off is handled elsewhere. The Foster BL12FS is a brass 1/8" straight-thru coup...

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$ 320.00
$ 320.00 - $ 320.00
$ 320.00
$ 256.00
$ 256.00 - $ 256.00
$ 256.00
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 %
$ 826.00
$ 826.00 - $ 826.00
$ 826.00
$ 660.00
$ 660.00 - $ 660.00
$ 660.00

Foster BL12FSS, 1/8" Straight-Thru Coupler x 1/8" Female NPT, FST Series, Ball Lock, 303 Stainless Steel

Maximum flow with no restriction, for air and fluid lines where shut-off is handled elsewhere. The Foster BL12FSS is a 303 stainless 1/8" straight-...

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$ 826.00
$ 826.00 - $ 826.00
$ 826.00
$ 660.00
$ 660.00 - $ 660.00
$ 660.00
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 %
$ 5,207.00
$ 5,207.00 - $ 5,207.00
$ 5,207.00
$ 4,165.00
$ 4,165.00 - $ 4,165.00
$ 4,165.00

Foster BL150FS, 1-1/2" Straight-Thru Coupler x 1-1/2" Female NPT, FST Series, Ball Lock, Brass

Maximum flow with no restriction, for air and fluid lines where shut-off is handled elsewhere. The Foster BL150FS is a brass 1-1/2" straight-thru c...

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$ 5,207.00
$ 5,207.00 - $ 5,207.00
$ 5,207.00
$ 4,165.00
$ 4,165.00 - $ 4,165.00
$ 4,165.00
Save 20% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
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$ 356.00
$ 356.00 - $ 356.00
$ 356.00
$ 285.00
$ 285.00 - $ 285.00
$ 285.00

Foster BL25FS, 1/4" Straight-Thru Coupler x 1/4" Female NPT, FST Series, Ball Lock, Brass

Maximum flow with no restriction, for air and fluid lines where shut-off is handled elsewhere. The Foster BL25FS is a brass 1/4" straight-thru coup...

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$ 356.00
$ 356.00 - $ 356.00
$ 356.00
$ 285.00
$ 285.00 - $ 285.00
$ 285.00
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 %
$ 1,271.00
$ 1,271.00 - $ 1,271.00
$ 1,271.00
$ 1,016.00
$ 1,016.00 - $ 1,016.00
$ 1,016.00

Foster BL25FSS, 1/4" Straight-Thru Coupler x 1/4" Female NPT, FST Series, Ball Lock, 303 Stainless Steel

Maximum flow with no restriction, for air and fluid lines where shut-off is handled elsewhere. The Foster BL25FSS is a 303 stainless 1/4" straight-...

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$ 1,271.00
$ 1,271.00 - $ 1,271.00
$ 1,271.00
$ 1,016.00
$ 1,016.00 - $ 1,016.00
$ 1,016.00
Save 20% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
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$ 413.00
$ 413.00 - $ 413.00
$ 413.00
$ 330.00
$ 330.00 - $ 330.00
$ 330.00

Foster BL38FS, 3/8" Straight-Thru Coupler x 3/8" Female NPT, FST Series, Ball Lock, Brass

Maximum flow with no restriction, for air and fluid lines where shut-off is handled elsewhere. The Foster BL38FS is a brass 3/8" straight-thru coup...

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$ 413.00
$ 413.00 - $ 413.00
$ 413.00
$ 330.00
$ 330.00 - $ 330.00
$ 330.00
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Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
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$ 1,369.00
$ 1,369.00 - $ 1,369.00
$ 1,369.00
$ 1,094.00
$ 1,094.00 - $ 1,094.00
$ 1,094.00

Foster BL38FSS, 3/8" Straight-Thru Coupler x 3/8" Female NPT, FST Series, Ball Lock, 303 Stainless Steel

Maximum flow with no restriction, for air and fluid lines where shut-off is handled elsewhere. The Foster BL38FSS is a 303 stainless 3/8" straight-...

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$ 1,369.00
$ 1,369.00 - $ 1,369.00
$ 1,369.00
$ 1,094.00
$ 1,094.00 - $ 1,094.00
$ 1,094.00
Save 20% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
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$ 534.00
$ 534.00 - $ 534.00
$ 534.00
$ 427.00
$ 427.00 - $ 427.00
$ 427.00

Foster BL50FS, 1/2" Straight-Thru Coupler x 1/2" Female NPT, FST Series, Ball Lock, Brass

Maximum flow with no restriction, for air and fluid lines where shut-off is handled elsewhere. The Foster BL50FS is a brass 1/2" straight-thru coup...

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$ 534.00
$ 534.00 - $ 534.00
$ 534.00
$ 427.00
$ 427.00 - $ 427.00
$ 427.00
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Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
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$ 1,547.00
$ 1,547.00 - $ 1,547.00
$ 1,547.00
$ 1,238.00
$ 1,238.00 - $ 1,238.00
$ 1,238.00

Foster BL50FSS, 1/2" Straight-Thru Coupler x 1/2" Female NPT, FST Series, Ball Lock, 303 Stainless Steel

Maximum flow with no restriction, for air and fluid lines where shut-off is handled elsewhere. The Foster BL50FSS is a 303 stainless 1/2" straight-...

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$ 1,547.00
$ 1,547.00 - $ 1,547.00
$ 1,547.00
$ 1,238.00
$ 1,238.00 - $ 1,238.00
$ 1,238.00
Save 20% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
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$ 811.00
$ 811.00 - $ 811.00
$ 811.00
$ 648.00
$ 648.00 - $ 648.00
$ 648.00

Foster BL75FS, 3/4" Straight-Thru Coupler x 3/4" Female NPT, FST Series, Ball Lock, Brass

Maximum flow with no restriction, for air and fluid lines where shut-off is handled elsewhere. The Foster BL75FS is a brass 3/4" straight-thru coup...

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$ 811.00
$ 811.00 - $ 811.00
$ 811.00
$ 648.00
$ 648.00 - $ 648.00
$ 648.00
Save 20% Save %

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