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Foster 3 Series Couplers

The Foster 3 Series is the 1/4" body industrial interchange, the most popular air coupler size for shop and industrial systems. This collection includes 3 Series couplers and plugs in brass, steel, and stainless with NPT, hose barb, push-on, and reusable terminations, plus automatic, sleeve guard, ball check, and dust cap options. Filter by thread, material, and coupler or plug to match your line.

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$ 223.00
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$ 223.00
$ 178.00
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$ 178.00

Foster 12-3S/S, 3 Series, Industrial Plug, 1/8" Male NPT, Stainless Steel

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 12-3S/S is a 303 Stainless 1/4" industrial plug from the Foster 3 Series —...

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$ 223.00
$ 223.00 - $ 223.00
$ 223.00
$ 178.00
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$ 178.00
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$ 342.00
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$ 342.00
$ 273.00
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$ 273.00

Foster 2803, 3 Series, Industrial Coupler, Manual, 1/8" Female NPT, Brass, Steel

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 2803 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series — t...

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$ 342.00
$ 342.00 - $ 342.00
$ 342.00
$ 273.00
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$ 273.00
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$ 292.00
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$ 292.00
$ 235.00
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$ 235.00

Foster 2903, 3 Series, Industrial Coupler, Manual, 1/8" Male NPT, Brass, Steel

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 2903 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series — t...

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$ 292.00
$ 292.00 - $ 292.00
$ 292.00
$ 235.00
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$ 235.00
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$ 1,201.00
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$ 1,201.00
$ 960.00
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$ 960.00

Foster 3603S/S, 3 Series, Industrial Coupler, Manual, 1/4" Hose Barb, Stainless Steel

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 3603S/S is a 303 Stainless 1/4" industrial coupler from the Foster 3 Serie...

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$ 1,201.00
$ 1,201.00 - $ 1,201.00
$ 1,201.00
$ 960.00
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$ 960.00
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$ 382.00
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$ 382.00
$ 305.00
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$ 305.00

Foster FM1513, 3 Series, Industrial Coupler, Automatic, 1/4" Push-On Hose Barb, Brass

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster FM1513 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...

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$ 382.00
$ 382.00 - $ 382.00
$ 382.00
$ 305.00
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$ 305.00
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$ 398.00
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$ 398.00
$ 317.00
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$ 317.00

Foster 3303GS, 3 Series, Industrial Coupler, Automatic, 3/8" Male NPT, Brass, Steel

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 3303GS is a Steel 1/4" industrial coupler from the Foster 3 Series — the m...

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$ 398.00
$ 398.00 - $ 398.00
$ 398.00
$ 317.00
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$ 317.00
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$ 458.00
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$ 458.00
$ 365.00
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$ 365.00

Foster 2803GB, 3 Series, Industrial Coupler, Automatic, 1/8" Female NPT, Brass

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 2803GB is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...

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$ 458.00
$ 458.00 - $ 458.00
$ 458.00
$ 365.00
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$ 365.00
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$ 61.00
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$ 61.00
$ 48.00
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$ 48.00

Foster 16-3, 3 Series, Industrial Plug, 1/4" Hose Barb, Steel

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 16-3 is a Steel 1/4" industrial plug from the Foster 3 Series — the most p...

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$ 61.00
$ 61.00 - $ 61.00
$ 61.00
$ 48.00
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$ 48.00
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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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$ 130.00
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$ 130.00
$ 104.00
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$ 104.00

Foster PB3-3, 1/4" Industrial Plug x Reusable Hose Fitting, 1/4" ID x 1/2" OD, 3 Series, Steel

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster PB3-3 is a Steel 1/4" industrial plug from the Foster 3 Series — the most ...

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$ 130.00
$ 130.00 - $ 130.00
$ 130.00
$ 104.00
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$ 104.00
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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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$ 353.00
$ 353.00 - $ 353.00
$ 353.00
$ 284.00
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$ 284.00

Foster SB3-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 1/2" OD, 3 Series, Brass/Steel

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster SB3-3 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series — ...

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$ 353.00
$ 353.00 - $ 353.00
$ 353.00
$ 284.00
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$ 284.00
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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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$ 298.00
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$ 298.00
$ 237.00
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$ 237.00

Foster 3003H, 1/4" Industrial Coupler x 1/4" Female NPT, 3 Series, Heat/Viton, Steel

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 3003H is a Steel 1/4" industrial coupler from the Foster 3 Series — the mo...

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$ 298.00
$ 298.00 - $ 298.00
$ 298.00
$ 237.00
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$ 237.00
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$ 513.00
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$ 513.00
$ 412.00
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$ 412.00

Foster 3603GB, 3 Series, Industrial Coupler, Automatic, 1/4" Hose Barb, Brass

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 3603GB is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...

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$ 513.00
$ 513.00 - $ 513.00
$ 513.00
$ 412.00
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$ 412.00
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$ 266.00
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$ 266.00
$ 212.00
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$ 212.00

Foster SG1513, 3 Series, Industrial Coupler, Manual, Sleeve Guard, 1/4" Push-On Hose Barb, Brass

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster SG1513 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...

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$ 266.00
$ 266.00 - $ 266.00
$ 266.00
$ 212.00
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$ 212.00
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$ 383.00
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$ 383.00
$ 307.00
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$ 307.00

Foster SG2803, 3 Series, Industrial Coupler, Manual, Sleeve Guard, 1/8" Female NPT, Brass

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster SG2803 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...

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$ 383.00
$ 383.00 - $ 383.00
$ 383.00
$ 307.00
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$ 307.00
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$ 316.00
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$ 316.00
$ 251.00
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$ 251.00

Foster SG2903, 3 Series, Industrial Coupler, Manual, Sleeve Guard, 1/8" Male NPT, Brass

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster SG2903 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...

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$ 316.00
$ 316.00 - $ 316.00
$ 316.00
$ 251.00
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$ 251.00
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$ 285.00
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$ 285.00
$ 228.00
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$ 228.00

Foster 1513, 3 Series, Industrial Coupler, Manual, 1/4" Hose Barb (Push-On), Brass, Steel

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 1513 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series — t...

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$ 285.00
$ 285.00 - $ 285.00
$ 285.00
$ 228.00
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$ 228.00
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$ 305.00
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$ 305.00
$ 244.00
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$ 244.00

Foster 3653, 3 Series, Industrial Coupler, Manual, 5/16" Hose Barb, Brass, Steel

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 3653 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series — t...

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$ 305.00
$ 305.00 - $ 305.00
$ 305.00
$ 244.00
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$ 244.00
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$ 802.00
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$ 802.00
$ 642.00
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$ 642.00

Foster 3103S/S, 3 Series, Industrial Coupler, Manual, 1/4" Male NPT, Stainless Steel

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 3103S/S is a 303 Stainless 1/4" industrial coupler from the Foster 3 Serie...

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$ 802.00
$ 802.00 - $ 802.00
$ 802.00
$ 642.00
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$ 642.00
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$ 795.00
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$ 795.00
$ 636.00
$ 636.00 - $ 636.00
$ 636.00

Foster 17-3S/S, 3 Series, Industrial Plug, 3/8" Hose Barb, Stainless Steel

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 17-3S/S is a 303 Stainless 1/4" industrial plug from the Foster 3 Series —...

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$ 795.00
$ 795.00 - $ 795.00
$ 795.00
$ 636.00
$ 636.00 - $ 636.00
$ 636.00
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$ 175.00
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$ 175.00
$ 139.00
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$ 139.00

Foster 12S-3, 3 Series, Industrial Swivel Plug, 1/8" Male NPT, Steel, Brass

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 12S-3 is a Brass/Steel 1/4" industrial plug from the Foster 3 Series — the...

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$ 175.00
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$ 175.00
$ 139.00
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$ 139.00
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$ 490.00
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$ 490.00
$ 392.00
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$ 392.00

Foster 14S-3, 3 Series, Industrial Swivel Plug, 3/8" Male NPT, Steel, Brass

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 14S-3 is a Brass/Steel 1/4" industrial plug from the Foster 3 Series — the...

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$ 490.00
$ 490.00 - $ 490.00
$ 490.00
$ 392.00
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$ 392.00
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$ 1,183.00
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$ 1,183.00
$ 946.00
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$ 946.00

Foster 3203S/S, 3 Series, Industrial Coupler, Manual, 3/8" Female NPT, Stainless Steel

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 3203S/S is a 303 Stainless 1/4" industrial coupler from the Foster 3 Serie...

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$ 1,183.00
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$ 1,183.00
$ 946.00
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$ 946.00
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$ 1,226.00
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$ 1,226.00
$ 982.00
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$ 982.00

Foster 3703S/S, 3 Series, Industrial Coupler, Manual, 3/8" Hose Barb, Stainless Steel

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 3703S/S is a 303 Stainless 1/4" industrial coupler from the Foster 3 Serie...

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$ 1,226.00
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$ 1,226.00
$ 982.00
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$ 982.00
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$ 414.00
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$ 414.00
$ 332.00
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$ 332.00

Foster FM3653, 3 Series, Industrial Coupler, Automatic, 5/16" Hose Barb, Brass

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster FM3653 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...

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$ 414.00
$ 414.00 - $ 414.00
$ 414.00
$ 332.00
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$ 332.00
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