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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 %
$ 282.00
$ 282.00 - $ 282.00
$ 282.00
$ 225.00
$ 225.00 - $ 225.00
$ 225.00

Foster 25FS-101, 1/4" Straight-Thru Coupler x 1/4" 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 25FS-101 is a brass 1/4" straight-thru co...

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$ 282.00
$ 282.00 - $ 282.00
$ 282.00
$ 225.00
$ 225.00 - $ 225.00
$ 225.00
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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 %
$ 1,115.00
$ 1,115.00 - $ 1,115.00
$ 1,115.00
$ 892.00
$ 892.00 - $ 892.00
$ 892.00

Foster 25FSS, 1/4" Straight-Thru Coupler x 1/4" 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 25FSS is a 303 stainless 1/4" straight-th...

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$ 1,115.00
$ 1,115.00 - $ 1,115.00
$ 1,115.00
$ 892.00
$ 892.00 - $ 892.00
$ 892.00
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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 %
$ 1,172.00
$ 1,172.00 - $ 1,172.00
$ 1,172.00
$ 939.00
$ 939.00 - $ 939.00
$ 939.00

Foster 25FSS-101, 1/4" Straight-Thru Coupler x 1/4" 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 25FSS-101 is a 303 stainless 1/4" straigh...

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$ 1,172.00
$ 1,172.00 - $ 1,172.00
$ 1,172.00
$ 939.00
$ 939.00 - $ 939.00
$ 939.00
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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 %
$ 1,167.00
$ 1,167.00 - $ 1,167.00
$ 1,167.00
$ 934.00
$ 934.00 - $ 934.00
$ 934.00

Foster 25FSS-103, 1/4" Straight-Thru Coupler x 1/4" 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 25FSS-103 is a 303 stainless 1/4" straigh...

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$ 1,167.00
$ 1,167.00 - $ 1,167.00
$ 1,167.00
$ 934.00
$ 934.00 - $ 934.00
$ 934.00
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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 %
$ 154.00
$ 154.00 - $ 154.00
$ 154.00
$ 123.00
$ 123.00 - $ 123.00
$ 123.00

Foster 25HP, 1/4" Straight-Thru Plug x 1/4" Hose ID, FST Series, Steel

Maximum flow with no restriction, for air and fluid lines where shut-off is handled elsewhere. The Foster 25HP is a steel 1/4" straight-thru plug i...

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$ 154.00
$ 154.00 - $ 154.00
$ 154.00
$ 123.00
$ 123.00 - $ 123.00
$ 123.00
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Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
Save 21% Save %
$ 99.00
$ 99.00 - $ 99.00
$ 99.00
$ 78.00
$ 78.00 - $ 78.00
$ 78.00

Foster 38FP, 3/8" Straight-Thru Plug x 3/8" Female NPT, FST Series, Steel

Maximum flow with no restriction, for air and fluid lines where shut-off is handled elsewhere. The Foster 38FP is a steel 3/8" straight-thru plug i...

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$ 99.00
$ 99.00 - $ 99.00
$ 99.00
$ 78.00
$ 78.00 - $ 78.00
$ 78.00
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Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
Save 21% Save %
$ 123.00
$ 123.00 - $ 123.00
$ 123.00
$ 97.00
$ 97.00 - $ 97.00
$ 97.00

Foster 38FPB, 3/8" Straight-Thru Plug x 3/8" Female NPT, FST Series, Brass

Maximum flow with no restriction, for air and fluid lines where shut-off is handled elsewhere. The Foster 38FPB is a brass 3/8" straight-thru plug ...

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$ 123.00
$ 123.00 - $ 123.00
$ 123.00
$ 97.00
$ 97.00 - $ 97.00
$ 97.00
Save 21% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
Save 20% Save %
$ 453.00
$ 453.00 - $ 453.00
$ 453.00
$ 363.00
$ 363.00 - $ 363.00
$ 363.00

Foster 38FPS, 3/8" Straight-Thru Plug x 3/8" 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 38FPS is a 303 stainless 3/8" straight-th...

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$ 453.00
$ 453.00 - $ 453.00
$ 453.00
$ 363.00
$ 363.00 - $ 363.00
$ 363.00
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Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
Save 19% Save %
$ 273.00
$ 273.00 - $ 273.00
$ 273.00
$ 220.00
$ 220.00 - $ 220.00
$ 220.00

Foster 38FS, 3/8" Straight-Thru Coupler x 3/8" Female NPT, FST Series, Brass

Maximum flow with no restriction, for air and fluid lines where shut-off is handled elsewhere. The Foster 38FS is a brass 3/8" straight-thru couple...

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$ 273.00
$ 273.00 - $ 273.00
$ 273.00
$ 220.00
$ 220.00 - $ 220.00
$ 220.00
Save 19% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
Save 20% Save %
$ 332.00
$ 332.00 - $ 332.00
$ 332.00
$ 265.00
$ 265.00 - $ 265.00
$ 265.00

Foster 38FS-101, 3/8" Straight-Thru Coupler x 3/8" 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 38FS-101 is a brass 3/8" straight-thru co...

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$ 332.00
$ 332.00 - $ 332.00
$ 332.00
$ 265.00
$ 265.00 - $ 265.00
$ 265.00
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 %
$ 318.00
$ 318.00 - $ 318.00
$ 318.00
$ 254.00
$ 254.00 - $ 254.00
$ 254.00

Foster 38FS-103, 3/8" Straight-Thru Coupler x 3/8" 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 38FS-103 is a brass 3/8" straight-thru co...

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$ 318.00
$ 318.00 - $ 318.00
$ 318.00
$ 254.00
$ 254.00 - $ 254.00
$ 254.00
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 %
$ 1,224.00
$ 1,224.00 - $ 1,224.00
$ 1,224.00
$ 978.00
$ 978.00 - $ 978.00
$ 978.00

Foster 38FSS, 3/8" Straight-Thru Coupler x 3/8" 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 38FSS is a 303 stainless 3/8" straight-th...

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$ 1,224.00
$ 1,224.00 - $ 1,224.00
$ 1,224.00
$ 978.00
$ 978.00 - $ 978.00
$ 978.00
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 %
$ 1,232.00
$ 1,232.00 - $ 1,232.00
$ 1,232.00
$ 985.00
$ 985.00 - $ 985.00
$ 985.00

Foster 38FSS-101, 3/8" Straight-Thru Coupler x 3/8" 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 38FSS-101 is a 303 stainless 3/8" straigh...

View full details
$ 1,232.00
$ 1,232.00 - $ 1,232.00
$ 1,232.00
$ 985.00
$ 985.00 - $ 985.00
$ 985.00
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 %
$ 1,226.00
$ 1,226.00 - $ 1,226.00
$ 1,226.00
$ 980.00
$ 980.00 - $ 980.00
$ 980.00

Foster 38FSS-103, 3/8" Straight-Thru Coupler x 3/8" 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 38FSS-103 is a 303 stainless 3/8" straigh...

View full details
$ 1,226.00
$ 1,226.00 - $ 1,226.00
$ 1,226.00
$ 980.00
$ 980.00 - $ 980.00
$ 980.00
Save 20% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
Save 19% Save %
$ 152.00
$ 152.00 - $ 152.00
$ 152.00
$ 123.00
$ 123.00 - $ 123.00
$ 123.00

Foster 38HPB, 3/8" Straight-Thru Plug x 3/8" Hose ID, FST Series, Brass

Maximum flow with no restriction, for air and fluid lines where shut-off is handled elsewhere. The Foster 38HPB is a brass 3/8" straight-thru plug ...

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$ 152.00
$ 152.00 - $ 152.00
$ 152.00
$ 123.00
$ 123.00 - $ 123.00
$ 123.00
Save 19% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
Save 20% Save %
$ 154.00
$ 154.00 - $ 154.00
$ 154.00
$ 123.00
$ 123.00 - $ 123.00
$ 123.00

Foster 50FP, 1/2" Straight-Thru Plug x 1/2" Female NPT, FST Series, Steel

Maximum flow with no restriction, for air and fluid lines where shut-off is handled elsewhere. The Foster 50FP is a steel 1/2" straight-thru plug i...

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$ 154.00
$ 154.00 - $ 154.00
$ 154.00
$ 123.00
$ 123.00 - $ 123.00
$ 123.00
Save 20% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
Save 21% Save %
$ 144.00
$ 144.00 - $ 144.00
$ 144.00
$ 114.00
$ 114.00 - $ 114.00
$ 114.00

Foster 50FPB, 1/2" Straight-Thru Plug x 1/2" Female NPT, FST Series, Brass

Maximum flow with no restriction, for air and fluid lines where shut-off is handled elsewhere. The Foster 50FPB is a brass 1/2" straight-thru plug ...

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$ 144.00
$ 144.00 - $ 144.00
$ 144.00
$ 114.00
$ 114.00 - $ 114.00
$ 114.00
Save 21% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
Save 20% Save %
$ 610.00
$ 610.00 - $ 610.00
$ 610.00
$ 488.00
$ 488.00 - $ 488.00
$ 488.00

Foster 50FPS, 1/2" Straight-Thru Plug x 1/2" 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 50FPS is a 303 stainless 1/2" straight-th...

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$ 610.00
$ 610.00 - $ 610.00
$ 610.00
$ 488.00
$ 488.00 - $ 488.00
$ 488.00
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 %
$ 384.00
$ 384.00 - $ 384.00
$ 384.00
$ 308.00
$ 308.00 - $ 308.00
$ 308.00

Foster 50FS, 1/2" Straight-Thru Coupler x 1/2" Female NPT, FST Series, Brass

Maximum flow with no restriction, for air and fluid lines where shut-off is handled elsewhere. The Foster 50FS is a brass 1/2" straight-thru couple...

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$ 384.00
$ 384.00 - $ 384.00
$ 384.00
$ 308.00
$ 308.00 - $ 308.00
$ 308.00
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 %
$ 436.00
$ 436.00 - $ 436.00
$ 436.00
$ 349.00
$ 349.00 - $ 349.00
$ 349.00

Foster 50FS-101, 1/2" Straight-Thru Coupler x 1/2" 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 50FS-101 is a brass 1/2" straight-thru co...

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$ 436.00
$ 436.00 - $ 436.00
$ 436.00
$ 349.00
$ 349.00 - $ 349.00
$ 349.00
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 %
$ 429.00
$ 429.00 - $ 429.00
$ 429.00
$ 344.00
$ 344.00 - $ 344.00
$ 344.00

Foster 50FS-103, 1/2" Straight-Thru Coupler x 1/2" 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 50FS-103 is a brass 1/2" straight-thru co...

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$ 429.00
$ 429.00 - $ 429.00
$ 429.00
$ 344.00
$ 344.00 - $ 344.00
$ 344.00
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 %
$ 1,348.00
$ 1,348.00 - $ 1,348.00
$ 1,348.00
$ 1,079.00
$ 1,079.00 - $ 1,079.00
$ 1,079.00

Foster 50FSS, 1/2" Straight-Thru Coupler x 1/2" 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 50FSS is a 303 stainless 1/2" straight-th...

View full details
$ 1,348.00
$ 1,348.00 - $ 1,348.00
$ 1,348.00
$ 1,079.00
$ 1,079.00 - $ 1,079.00
$ 1,079.00
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 %
$ 1,397.00
$ 1,397.00 - $ 1,397.00
$ 1,397.00
$ 1,118.00
$ 1,118.00 - $ 1,118.00
$ 1,118.00

Foster 50FSS-101, 1/2" Straight-Thru Coupler x 1/2" 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 50FSS-101 is a 303 stainless 1/2" straigh...

View full details
$ 1,397.00
$ 1,397.00 - $ 1,397.00
$ 1,397.00
$ 1,118.00
$ 1,118.00 - $ 1,118.00
$ 1,118.00
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 %
$ 1,421.00
$ 1,421.00 - $ 1,421.00
$ 1,421.00
$ 1,137.00
$ 1,137.00 - $ 1,137.00
$ 1,137.00

Foster 50FSS-103, 1/2" Straight-Thru Coupler x 1/2" 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 50FSS-103 is a 303 stainless 1/2" straigh...

View full details
$ 1,421.00
$ 1,421.00 - $ 1,421.00
$ 1,421.00
$ 1,137.00
$ 1,137.00 - $ 1,137.00
$ 1,137.00
Save 20% Save %

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