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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 %
$ 299.00
$ 299.00 - $ 299.00
$ 299.00
$ 238.00
$ 238.00 - $ 238.00
$ 238.00

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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$ 299.00
$ 299.00 - $ 299.00
$ 299.00
$ 238.00
$ 238.00 - $ 238.00
$ 238.00
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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 %
$ 1,182.00
$ 1,182.00 - $ 1,182.00
$ 1,182.00
$ 945.00
$ 945.00 - $ 945.00
$ 945.00

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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$ 1,182.00
$ 1,182.00 - $ 1,182.00
$ 1,182.00
$ 945.00
$ 945.00 - $ 945.00
$ 945.00
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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 %
$ 1,242.00
$ 1,242.00 - $ 1,242.00
$ 1,242.00
$ 995.00
$ 995.00 - $ 995.00
$ 995.00

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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$ 1,242.00
$ 1,242.00 - $ 1,242.00
$ 1,242.00
$ 995.00
$ 995.00 - $ 995.00
$ 995.00
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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 %
$ 1,237.00
$ 1,237.00 - $ 1,237.00
$ 1,237.00
$ 989.00
$ 989.00 - $ 989.00
$ 989.00

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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$ 1,237.00
$ 1,237.00 - $ 1,237.00
$ 1,237.00
$ 989.00
$ 989.00 - $ 989.00
$ 989.00
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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 %
$ 163.00
$ 163.00 - $ 163.00
$ 163.00
$ 130.00
$ 130.00 - $ 130.00
$ 130.00

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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$ 163.00
$ 163.00 - $ 163.00
$ 163.00
$ 130.00
$ 130.00 - $ 130.00
$ 130.00
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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 %
$ 105.00
$ 105.00 - $ 105.00
$ 105.00
$ 83.00
$ 83.00 - $ 83.00
$ 83.00

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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$ 105.00
$ 105.00 - $ 105.00
$ 105.00
$ 83.00
$ 83.00 - $ 83.00
$ 83.00
Save 21% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
Save 21% Save %
$ 130.00
$ 130.00 - $ 130.00
$ 130.00
$ 103.00
$ 103.00 - $ 103.00
$ 103.00

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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$ 130.00
$ 130.00 - $ 130.00
$ 130.00
$ 103.00
$ 103.00 - $ 103.00
$ 103.00
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 %
$ 480.00
$ 480.00 - $ 480.00
$ 480.00
$ 385.00
$ 385.00 - $ 385.00
$ 385.00

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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$ 480.00
$ 480.00 - $ 480.00
$ 480.00
$ 385.00
$ 385.00 - $ 385.00
$ 385.00
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 %
$ 290.00
$ 290.00 - $ 290.00
$ 290.00
$ 233.00
$ 233.00 - $ 233.00
$ 233.00

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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$ 290.00
$ 290.00 - $ 290.00
$ 290.00
$ 233.00
$ 233.00 - $ 233.00
$ 233.00
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 %
$ 352.00
$ 352.00 - $ 352.00
$ 352.00
$ 281.00
$ 281.00 - $ 281.00
$ 281.00

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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$ 352.00
$ 352.00 - $ 352.00
$ 352.00
$ 281.00
$ 281.00 - $ 281.00
$ 281.00
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 %
$ 337.00
$ 337.00 - $ 337.00
$ 337.00
$ 270.00
$ 270.00 - $ 270.00
$ 270.00

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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$ 337.00
$ 337.00 - $ 337.00
$ 337.00
$ 270.00
$ 270.00 - $ 270.00
$ 270.00
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 %
$ 1,297.00
$ 1,297.00 - $ 1,297.00
$ 1,297.00
$ 1,037.00
$ 1,037.00 - $ 1,037.00
$ 1,037.00

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...

View full details
$ 1,297.00
$ 1,297.00 - $ 1,297.00
$ 1,297.00
$ 1,037.00
$ 1,037.00 - $ 1,037.00
$ 1,037.00
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 %
$ 1,306.00
$ 1,306.00 - $ 1,306.00
$ 1,306.00
$ 1,044.00
$ 1,044.00 - $ 1,044.00
$ 1,044.00

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
$ 1,306.00
$ 1,306.00 - $ 1,306.00
$ 1,306.00
$ 1,044.00
$ 1,044.00 - $ 1,044.00
$ 1,044.00
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 %
$ 1,299.00
$ 1,299.00 - $ 1,299.00
$ 1,299.00
$ 1,039.00
$ 1,039.00 - $ 1,039.00
$ 1,039.00

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
$ 1,299.00
$ 1,299.00 - $ 1,299.00
$ 1,299.00
$ 1,039.00
$ 1,039.00 - $ 1,039.00
$ 1,039.00
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 %
$ 161.00
$ 161.00 - $ 161.00
$ 161.00
$ 130.00
$ 130.00 - $ 130.00
$ 130.00

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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$ 161.00
$ 161.00 - $ 161.00
$ 161.00
$ 130.00
$ 130.00 - $ 130.00
$ 130.00
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 %
$ 163.00
$ 163.00 - $ 163.00
$ 163.00
$ 130.00
$ 130.00 - $ 130.00
$ 130.00

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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$ 163.00
$ 163.00 - $ 163.00
$ 163.00
$ 130.00
$ 130.00 - $ 130.00
$ 130.00
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 %
$ 152.00
$ 152.00 - $ 152.00
$ 152.00
$ 121.00
$ 121.00 - $ 121.00
$ 121.00

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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$ 152.00
$ 152.00 - $ 152.00
$ 152.00
$ 121.00
$ 121.00 - $ 121.00
$ 121.00
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 %
$ 647.00
$ 647.00 - $ 647.00
$ 647.00
$ 517.00
$ 517.00 - $ 517.00
$ 517.00

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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$ 647.00
$ 647.00 - $ 647.00
$ 647.00
$ 517.00
$ 517.00 - $ 517.00
$ 517.00
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 %
$ 407.00
$ 407.00 - $ 407.00
$ 407.00
$ 326.00
$ 326.00 - $ 326.00
$ 326.00

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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$ 407.00
$ 407.00 - $ 407.00
$ 407.00
$ 326.00
$ 326.00 - $ 326.00
$ 326.00
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 %
$ 462.00
$ 462.00 - $ 462.00
$ 462.00
$ 370.00
$ 370.00 - $ 370.00
$ 370.00

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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$ 462.00
$ 462.00 - $ 462.00
$ 462.00
$ 370.00
$ 370.00 - $ 370.00
$ 370.00
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 %
$ 455.00
$ 455.00 - $ 455.00
$ 455.00
$ 365.00
$ 365.00 - $ 365.00
$ 365.00

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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$ 455.00
$ 455.00 - $ 455.00
$ 455.00
$ 365.00
$ 365.00 - $ 365.00
$ 365.00
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 %
$ 1,429.00
$ 1,429.00 - $ 1,429.00
$ 1,429.00
$ 1,143.00
$ 1,143.00 - $ 1,143.00
$ 1,143.00

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
$ 1,429.00
$ 1,429.00 - $ 1,429.00
$ 1,429.00
$ 1,143.00
$ 1,143.00 - $ 1,143.00
$ 1,143.00
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 %
$ 1,480.00
$ 1,480.00 - $ 1,480.00
$ 1,480.00
$ 1,185.00
$ 1,185.00 - $ 1,185.00
$ 1,185.00

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
$ 1,480.00
$ 1,480.00 - $ 1,480.00
$ 1,480.00
$ 1,185.00
$ 1,185.00 - $ 1,185.00
$ 1,185.00
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 %
$ 1,506.00
$ 1,506.00 - $ 1,506.00
$ 1,506.00
$ 1,206.00
$ 1,206.00 - $ 1,206.00
$ 1,206.00

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
$ 1,506.00
$ 1,506.00 - $ 1,506.00
$ 1,506.00
$ 1,206.00
$ 1,206.00 - $ 1,206.00
$ 1,206.00
Save 20% Save %

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