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 $ 848.00Original price $ 848.00 - Original price $ 848.00Original price $ 848.00Current price $ 678.00$ 678.00 - $ 678.00Current price $ 678.00
Foster 3003S/SH, 1/4" Industrial Coupler x 1/4" Female NPT, 3 Series, Heat/Viton, 303 Stainless
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3003S/SH is a 303 Stainless 1/4" industrial coupler from the Foster 3 Seri...
View full detailsOriginal price $ 848.00Original price $ 848.00 - Original price $ 848.00Original price $ 848.00Current price $ 678.00$ 678.00 - $ 678.00Current price $ 678.00Save 20% -
Original price $ 892.00Original price $ 892.00 - Original price $ 892.00Original price $ 892.00Current price $ 713.00$ 713.00 - $ 713.00Current price $ 713.00
Foster BL3003S/S, 1/4" Industrial Coupler x 1/4" Female NPT, 3 Series, Ball Lock, 303 Stainless
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster BL3003S/S is a 303 Stainless 1/4" industrial coupler from the Foster 3 Ser...
View full detailsOriginal price $ 892.00Original price $ 892.00 - Original price $ 892.00Original price $ 892.00Current price $ 713.00$ 713.00 - $ 713.00Current price $ 713.00Save 20% -
Original price $ 792.00Original price $ 792.00 - Original price $ 792.00Original price $ 792.00Current price $ 633.00$ 633.00 - $ 633.00Current price $ 633.00
Foster 3003S/S, 1/4" Industrial Coupler x 1/4" Female NPT, 3 Series, 303 Stainless
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3003S/S is a 303 Stainless 1/4" industrial coupler from the Foster 3 Serie...
View full detailsOriginal price $ 792.00Original price $ 792.00 - Original price $ 792.00Original price $ 792.00Current price $ 633.00$ 633.00 - $ 633.00Current price $ 633.00Save 20% -
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 3003S, 1/4" Industrial Coupler x 1/4" Female NPT, 3 Series, Steam/EPDM, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3003S 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 $ 252.00Original price $ 252.00 - Original price $ 252.00Original price $ 252.00Current price $ 202.00$ 202.00 - $ 202.00Current price $ 202.00
Foster 3003LV, 1/4" Industrial Coupler x 1/4" Female NPT, 3 Series, Less Valve, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3003LV is a Steel 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price $ 252.00Original price $ 252.00 - Original price $ 252.00Original price $ 252.00Current price $ 202.00$ 202.00 - $ 202.00Current price $ 202.00Save 20% -
Original price $ 356.00Original price $ 356.00 - Original price $ 356.00Original price $ 356.00Current price $ 285.00$ 285.00 - $ 285.00Current price $ 285.00
Foster 3003HW, 1/4" Industrial Coupler x 1/4" Female NPT, 3 Series, Hot Water/Viton, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3003HW is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — th...
View full detailsOriginal price $ 356.00Original price $ 356.00 - Original price $ 356.00Original price $ 356.00Current price $ 285.00$ 285.00 - $ 285.00Current price $ 285.00Save 20% -
Original price $ 299.00Original price $ 299.00 - Original price $ 299.00Original price $ 299.00Current price $ 238.00$ 238.00 - $ 238.00Current price $ 238.00
Foster 3003H, 1/4" Industrial Coupler x 1/4" Female NPT, 3 Series, Heat/Viton, Steel
In stockReliable, 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...
View full detailsOriginal price $ 299.00Original price $ 299.00 - Original price $ 299.00Original price $ 299.00Current price $ 238.00$ 238.00 - $ 238.00Current price $ 238.00Save 20% -
Original price $ 285.00Original price $ 285.00 - Original price $ 285.00Original price $ 285.00Current price $ 227.00$ 227.00 - $ 227.00Current price $ 227.00
Foster 3003D, 1/4" Industrial Coupler x 1/4" Female NPT, 3 Series, Dill Valve, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3003D is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series — ...
View full detailsOriginal price $ 285.00Original price $ 285.00 - Original price $ 285.00Original price $ 285.00Current price $ 227.00$ 227.00 - $ 227.00Current price $ 227.00Save 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 BL3003, 1/4" Industrial Coupler x 1/4" Female NPT, 3 Series, Ball Lock, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster BL3003 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 $ 268.00Original price $ 268.00 - Original price $ 268.00Original price $ 268.00Current price $ 215.00$ 215.00 - $ 215.00Current price $ 215.00
Foster 3003, 1/4" Industrial Coupler x 1/4" Female NPT, 3 Series, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3003 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series — t...
View full detailsOriginal price $ 268.00Original price $ 268.00 - Original price $ 268.00Original price $ 268.00Current price $ 215.00$ 215.00 - $ 215.00Current price $ 215.00Save 20% -
Original price $ 415.00Original price $ 415.00 - Original price $ 415.00Original price $ 415.00Current price $ 333.00$ 333.00 - $ 333.00Current price $ 333.00
Foster 2803W, 1/4" Industrial Coupler x 1/8" Female NPT, 3 Series, Water, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 2803W is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — the...
View full detailsOriginal price $ 415.00Original price $ 415.00 - Original price $ 415.00Original price $ 415.00Current price $ 333.00$ 333.00 - $ 333.00Current price $ 333.00Save 20% -
Original price $ 1,066.00Original price $ 1,066.00 - Original price $ 1,066.00Original price $ 1,066.00Current price $ 853.00$ 853.00 - $ 853.00Current price $ 853.00
Foster 2803S/S, 1/4" Industrial Coupler x 1/8" Female NPT, 3 Series, 303 Stainless
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 2803S/S is a 303 Stainless 1/4" industrial coupler from the Foster 3 Serie...
View full detailsOriginal price $ 1,066.00Original price $ 1,066.00 - Original price $ 1,066.00Original price $ 1,066.00Current price $ 853.00$ 853.00 - $ 853.00Current price $ 853.00Save 20% -
Original price $ 422.00Original price $ 422.00 - Original price $ 422.00Original price $ 422.00Current price $ 338.00$ 338.00 - $ 338.00Current price $ 338.00
Foster 2803S, 1/4" Industrial Coupler x 1/8" Female NPT, 3 Series, Steam/EPDM, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 2803S is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — the...
View full detailsOriginal price $ 422.00Original price $ 422.00 - Original price $ 422.00Original price $ 422.00Current price $ 338.00$ 338.00 - $ 338.00Current price $ 338.00Save 20% -
Original price $ 397.00Original price $ 397.00 - Original price $ 397.00Original price $ 397.00Current price $ 318.00$ 318.00 - $ 318.00Current price $ 318.00
Foster 2803H, 1/4" Industrial Coupler x 1/8" Female NPT, 3 Series, Heat/Viton, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 2803H is a Steel 1/4" industrial coupler from the Foster 3 Series — the mo...
View full detailsOriginal price $ 397.00Original price $ 397.00 - Original price $ 397.00Original price $ 397.00Current price $ 318.00$ 318.00 - $ 318.00Current price $ 318.00Save 20% -
Original price $ 349.00Original price $ 349.00 - Original price $ 349.00Original price $ 349.00Current price $ 279.00$ 279.00 - $ 279.00Current price $ 279.00
Foster BL2803, 1/4" Industrial Coupler x 1/8" Female NPT, 3 Series, Ball Lock, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster BL2803 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series —...
View full detailsOriginal price $ 349.00Original price $ 349.00 - Original price $ 349.00Original price $ 349.00Current price $ 279.00$ 279.00 - $ 279.00Current price $ 279.00Save 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 2803, 1/4" Industrial Coupler x 1/8" Female NPT, 3 Series, Brass/Steel
In stockReliable, 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...
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%
