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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Original price $ 862.00Original price $ 862.00 - Original price $ 862.00Original price $ 862.00Current price $ 688.00$ 688.00 - $ 688.00Current price $ 688.00
Foster BL3103S/S, 1/4" Industrial Coupler x 1/4" Male NPT, 3 Series, Ball Lock, 303 Stainless
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster BL3103S/S is a 303 Stainless 1/4" industrial coupler from the Foster 3 Ser...
View full detailsOriginal price $ 862.00Original price $ 862.00 - Original price $ 862.00Original price $ 862.00Current price $ 688.00$ 688.00 - $ 688.00Current price $ 688.00Save 20% -
Original price $ 804.00Original price $ 804.00 - Original price $ 804.00Original price $ 804.00Current price $ 644.00$ 644.00 - $ 644.00Current price $ 644.00
Foster 3103S/S, 1/4" Industrial Coupler x 1/4" Male NPT, 3 Series, 303 Stainless
In stockReliable, 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...
View full detailsOriginal price $ 804.00Original price $ 804.00 - Original price $ 804.00Original price $ 804.00Current price $ 644.00$ 644.00 - $ 644.00Current price $ 644.00Save 20% -
Original price $ 309.00Original price $ 309.00 - Original price $ 309.00Original price $ 309.00Current price $ 249.00$ 249.00 - $ 249.00Current price $ 249.00
Foster 3103S, 1/4" Industrial Coupler x 1/4" Male NPT, 3 Series, Steam/EPDM, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3103S is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — the...
View full detailsOriginal price $ 309.00Original price $ 309.00 - Original price $ 309.00Original price $ 309.00Current price $ 249.00$ 249.00 - $ 249.00Current price $ 249.00Save 19% -
Original price $ 231.00Original price $ 231.00 - Original price $ 231.00Original price $ 231.00Current price $ 184.00$ 184.00 - $ 184.00Current price $ 184.00
Foster 3103LV, 1/4" Industrial Coupler x 1/4" Male NPT, 3 Series, Less Valve, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3103LV is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series —...
View full detailsOriginal price $ 231.00Original price $ 231.00 - Original price $ 231.00Original price $ 231.00Current price $ 184.00$ 184.00 - $ 184.00Current price $ 184.00Save 20% -
Original price $ 272.00Original price $ 272.00 - Original price $ 272.00Original price $ 272.00Current price $ 218.00$ 218.00 - $ 218.00Current price $ 218.00
Foster 3103H, 1/4" Industrial Coupler x 1/4" Male NPT, 3 Series, Heat/Viton, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3103H is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series — ...
View full detailsOriginal price $ 272.00Original price $ 272.00 - Original price $ 272.00Original price $ 272.00Current price $ 218.00$ 218.00 - $ 218.00Current price $ 218.00Save 20% -
Original price $ 250.00Original price $ 250.00 - Original price $ 250.00Original price $ 250.00Current price $ 200.00$ 200.00 - $ 200.00Current price $ 200.00
Foster 3103D, 1/4" Industrial Coupler x 1/4" Male NPT, 3 Series, Dill Valve, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3103D is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series — ...
View full detailsOriginal price $ 250.00Original price $ 250.00 - Original price $ 250.00Original price $ 250.00Current price $ 200.00$ 200.00 - $ 200.00Current price $ 200.00Save 20% -
Original price $ 284.00Original price $ 284.00 - Original price $ 284.00Original price $ 284.00Current price $ 227.00$ 227.00 - $ 227.00Current price $ 227.00
Foster BL3103, 1/4" Industrial Coupler x 1/4" Male NPT, 3 Series, Ball Lock, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster BL3103 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series —...
View full detailsOriginal price $ 284.00Original price $ 284.00 - Original price $ 284.00Original price $ 284.00Current price $ 227.00$ 227.00 - $ 227.00Current price $ 227.00Save 20% -
Original price $ 243.00Original price $ 243.00 - Original price $ 243.00Original price $ 243.00Current price $ 195.00$ 195.00 - $ 195.00Current price $ 195.00
Foster 3103, 1/4" Industrial Coupler x 1/4" Male NPT, 3 Series, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3103 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series — t...
View full detailsOriginal price $ 243.00Original price $ 243.00 - Original price $ 243.00Original price $ 243.00Current price $ 195.00$ 195.00 - $ 195.00Current price $ 195.00Save 20% -
Original price $ 1,380.00Original price $ 1,380.00 - Original price $ 1,380.00Original price $ 1,380.00Current price $ 1,103.00$ 1,103.00 - $ 1,103.00Current price $ 1,103.00
Foster BL2903S/S, 1/4" Industrial Coupler x 1/8" Male NPT, 3 Series, Ball Lock, 303 Stainless
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster BL2903S/S is a 303 Stainless 1/4" industrial coupler from the Foster 3 Ser...
View full detailsOriginal price $ 1,380.00Original price $ 1,380.00 - Original price $ 1,380.00Original price $ 1,380.00Current price $ 1,103.00$ 1,103.00 - $ 1,103.00Current price $ 1,103.00Save 20% -
Original price $ 1,292.00Original price $ 1,292.00 - Original price $ 1,292.00Original price $ 1,292.00Current price $ 1,033.00$ 1,033.00 - $ 1,033.00Current price $ 1,033.00
Foster 2903S/S, 1/4" Industrial Coupler x 1/8" Male NPT, 3 Series, 303 Stainless
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 2903S/S is a 303 Stainless 1/4" industrial coupler from the Foster 3 Serie...
View full detailsOriginal price $ 1,292.00Original price $ 1,292.00 - Original price $ 1,292.00Original price $ 1,292.00Current price $ 1,033.00$ 1,033.00 - $ 1,033.00Current price $ 1,033.00Save 20% -
Original price $ 354.00Original price $ 354.00 - Original price $ 354.00Original price $ 354.00Current price $ 283.00$ 283.00 - $ 283.00Current price $ 283.00
Foster 2903S, 1/4" Industrial Coupler x 1/8" Male NPT, 3 Series, Steam/EPDM, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 2903S is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — the...
View full detailsOriginal price $ 354.00Original price $ 354.00 - Original price $ 354.00Original price $ 354.00Current price $ 283.00$ 283.00 - $ 283.00Current price $ 283.00Save 20% -
Original price $ 331.00Original price $ 331.00 - Original price $ 331.00Original price $ 331.00Current price $ 265.00$ 265.00 - $ 265.00Current price $ 265.00
Foster 2903H, 1/4" Industrial Coupler x 1/8" Male NPT, 3 Series, Heat/Viton, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 2903H is a Steel 1/4" industrial coupler from the Foster 3 Series — the mo...
View full detailsOriginal price $ 331.00Original price $ 331.00 - Original price $ 331.00Original price $ 331.00Current price $ 265.00$ 265.00 - $ 265.00Current price $ 265.00Save 20% -
Original price $ 320.00Original price $ 320.00 - Original price $ 320.00Original price $ 320.00Current price $ 256.00$ 256.00 - $ 256.00Current price $ 256.00
Foster BL2903, 1/4" Industrial Coupler x 1/8" Male NPT, 3 Series, Ball Lock, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster BL2903 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series —...
View full detailsOriginal price $ 320.00Original price $ 320.00 - Original price $ 320.00Original price $ 320.00Current price $ 256.00$ 256.00 - $ 256.00Current price $ 256.00Save 20% -
Original price $ 293.00Original price $ 293.00 - Original price $ 293.00Original price $ 293.00Current price $ 236.00$ 236.00 - $ 236.00Current price $ 236.00
Foster 2903, 1/4" Industrial Coupler x 1/8" Male NPT, 3 Series, Brass/Steel
In stockReliable, 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...
View full detailsOriginal price $ 293.00Original price $ 293.00 - Original price $ 293.00Original price $ 293.00Current price $ 236.00$ 236.00 - $ 236.00Current price $ 236.00Save 19% -
Original price $ 340.00Original price $ 340.00 - Original price $ 340.00Original price $ 340.00Current price $ 272.00$ 272.00 - $ 272.00Current price $ 272.00
Foster 3203W, 1/4" Industrial Coupler x 3/8" Female NPT, 3 Series, Water, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3203W is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — the...
View full detailsOriginal price $ 340.00Original price $ 340.00 - Original price $ 340.00Original price $ 340.00Current price $ 272.00$ 272.00 - $ 272.00Current price $ 272.00Save 20% -
Original price $ 1,208.00Original price $ 1,208.00 - Original price $ 1,208.00Original price $ 1,208.00Current price $ 967.00$ 967.00 - $ 967.00Current price $ 967.00
Foster 3203S/SLV, 1/4" Industrial Coupler x 3/8" Female NPT, 3 Series, Less Valve, 303 Stainless
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3203S/SLV is a 303 Stainless 1/4" industrial coupler from the Foster 3 Ser...
View full detailsOriginal price $ 1,208.00Original price $ 1,208.00 - Original price $ 1,208.00Original price $ 1,208.00Current price $ 967.00$ 967.00 - $ 967.00Current price $ 967.00Save 20% -
Original price $ 1,292.00Original price $ 1,292.00 - Original price $ 1,292.00Original price $ 1,292.00Current price $ 1,033.00$ 1,033.00 - $ 1,033.00Current price $ 1,033.00
Foster BL3203S/S, 1/4" Industrial Coupler x 3/8" Female NPT, 3 Series, Ball Lock, 303 Stainless
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster BL3203S/S is a 303 Stainless 1/4" industrial coupler from the Foster 3 Ser...
View full detailsOriginal price $ 1,292.00Original price $ 1,292.00 - Original price $ 1,292.00Original price $ 1,292.00Current price $ 1,033.00$ 1,033.00 - $ 1,033.00Current price $ 1,033.00Save 20% -
Original price $ 1,187.00Original price $ 1,187.00 - Original price $ 1,187.00Original price $ 1,187.00Current price $ 949.00$ 949.00 - $ 949.00Current price $ 949.00
Foster 3203S/S, 1/4" Industrial Coupler x 3/8" Female NPT, 3 Series, 303 Stainless
In stockReliable, 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...
View full detailsOriginal price $ 1,187.00Original price $ 1,187.00 - Original price $ 1,187.00Original price $ 1,187.00Current price $ 949.00$ 949.00 - $ 949.00Current price $ 949.00Save 20% -
Original price $ 254.00Original price $ 254.00 - Original price $ 254.00Original price $ 254.00Current price $ 204.00$ 204.00 - $ 204.00Current price $ 204.00
Foster 3203LV, 1/4" Industrial Coupler x 3/8" Female NPT, 3 Series, Less Valve, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3203LV is a Steel 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price $ 254.00Original price $ 254.00 - Original price $ 254.00Original price $ 254.00Current price $ 204.00$ 204.00 - $ 204.00Current price $ 204.00Save 20% -
Original price $ 295.00Original price $ 295.00 - Original price $ 295.00Original price $ 295.00Current price $ 236.00$ 236.00 - $ 236.00Current price $ 236.00
Foster 3203H, 1/4" Industrial Coupler x 3/8" Female NPT, 3 Series, Heat/Viton, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3203H is a Steel 1/4" industrial coupler from the Foster 3 Series — the mo...
View full detailsOriginal price $ 295.00Original price $ 295.00 - Original price $ 295.00Original price $ 295.00Current price $ 236.00$ 236.00 - $ 236.00Current price $ 236.00Save 20% -
Original price $ 308.00Original price $ 308.00 - Original price $ 308.00Original price $ 308.00Current price $ 245.00$ 245.00 - $ 245.00Current price $ 245.00
Foster BL3203, 1/4" Industrial Coupler x 3/8" Female NPT, 3 Series, Ball Lock, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster BL3203 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series —...
View full detailsOriginal price $ 308.00Original price $ 308.00 - Original price $ 308.00Original price $ 308.00Current price $ 245.00$ 245.00 - $ 245.00Current price $ 245.00Save 20% -
Original price $ 272.00Original price $ 272.00 - Original price $ 272.00Original price $ 272.00Current price $ 218.00$ 218.00 - $ 218.00Current price $ 218.00
Foster 3203, 1/4" Industrial Coupler x 3/8" Female NPT, 3 Series, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3203 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series — t...
View full detailsOriginal price $ 272.00Original price $ 272.00 - Original price $ 272.00Original price $ 272.00Current price $ 218.00$ 218.00 - $ 218.00Current price $ 218.00Save 20% -
Original price $ 418.00Original price $ 418.00 - Original price $ 418.00Original price $ 418.00Current price $ 334.00$ 334.00 - $ 334.00Current price $ 334.00
Foster BL3003W, 1/4" Industrial Coupler x 1/4" Female NPT, 3 Series, Ball Lock, Water, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster BL3003W is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — t...
View full detailsOriginal price $ 418.00Original price $ 418.00 - Original price $ 418.00Original price $ 418.00Current price $ 334.00$ 334.00 - $ 334.00Current price $ 334.00Save 20% -
Original price $ 343.00Original price $ 343.00 - Original price $ 343.00Original price $ 343.00Current price $ 274.00$ 274.00 - $ 274.00Current price $ 274.00
Foster 3003W, 1/4" Industrial Coupler x 1/4" Female NPT, 3 Series, Water, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3003W is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — the...
View full detailsOriginal price $ 343.00Original price $ 343.00 - Original price $ 343.00Original price $ 343.00Current price $ 274.00$ 274.00 - $ 274.00Current price $ 274.00Save 20%
