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 $ 464.00Original price $ 464.00 - Original price $ 464.00Original price $ 464.00Current price $ 371.00$ 371.00 - $ 371.00Current price $ 371.00
Foster FM3303W, 1/4" Industrial Coupler x 3/8" Male NPT, 3 Series, Automatic, Water, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster FM3303W is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — t...
View full detailsOriginal price $ 464.00Original price $ 464.00 - Original price $ 464.00Original price $ 464.00Current price $ 371.00$ 371.00 - $ 371.00Current price $ 371.00Save 20% -
Original price $ 460.00Original price $ 460.00 - Original price $ 460.00Original price $ 460.00Current price $ 367.00$ 367.00 - $ 367.00Current price $ 367.00
Foster SL3303, 1/4" Industrial Coupler x 3/8" Male NPT, 3 Series, Automatic Sleeve Lock, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SL3303 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price $ 460.00Original price $ 460.00 - Original price $ 460.00Original price $ 460.00Current price $ 367.00$ 367.00 - $ 367.00Current price $ 367.00Save 20% -
Original price $ 401.00Original price $ 401.00 - Original price $ 401.00Original price $ 401.00Current price $ 321.00$ 321.00 - $ 321.00Current price $ 321.00
Foster FM3303, 1/4" Industrial Coupler x 3/8" Male NPT, 3 Series, Automatic, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster FM3303 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price $ 401.00Original price $ 401.00 - Original price $ 401.00Original price $ 401.00Current price $ 321.00$ 321.00 - $ 321.00Current price $ 321.00Save 20% -
Original price $ 543.00Original price $ 543.00 - Original price $ 543.00Original price $ 543.00Current price $ 434.00$ 434.00 - $ 434.00Current price $ 434.00
Foster SL3103W, 1/4" Industrial Coupler x 1/4" Male NPT, 3 Series, Automatic Sleeve Lock, Water, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SL3103W is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — t...
View full detailsOriginal price $ 543.00Original price $ 543.00 - Original price $ 543.00Original price $ 543.00Current price $ 434.00$ 434.00 - $ 434.00Current price $ 434.00Save 20% -
Original price $ 457.00Original price $ 457.00 - Original price $ 457.00Original price $ 457.00Current price $ 366.00$ 366.00 - $ 366.00Current price $ 366.00
Foster FM3103W, 1/4" Industrial Coupler x 1/4" Male NPT, 3 Series, Automatic, Water, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster FM3103W is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — t...
View full detailsOriginal price $ 457.00Original price $ 457.00 - Original price $ 457.00Original price $ 457.00Current price $ 366.00$ 366.00 - $ 366.00Current price $ 366.00Save 20% -
Original price $ 450.00Original price $ 450.00 - Original price $ 450.00Original price $ 450.00Current price $ 360.00$ 360.00 - $ 360.00Current price $ 360.00
Foster FM3103S, 1/4" Industrial Coupler x 1/4" Male NPT, 3 Series, Automatic, Steam/EPDM, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster FM3103S is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — t...
View full detailsOriginal price $ 450.00Original price $ 450.00 - Original price $ 450.00Original price $ 450.00Current price $ 360.00$ 360.00 - $ 360.00Current price $ 360.00Save 20% -
Original price $ 521.00Original price $ 521.00 - Original price $ 521.00Original price $ 521.00Current price $ 417.00$ 417.00 - $ 417.00Current price $ 417.00
Foster SL3103HW, 1/4" Industrial Coupler x 1/4" Male NPT, 3 Series, Automatic Sleeve Lock, Hot Water/Viton, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SL3103HW is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — ...
View full detailsOriginal price $ 521.00Original price $ 521.00 - Original price $ 521.00Original price $ 521.00Current price $ 417.00$ 417.00 - $ 417.00Current price $ 417.00Save 20% -
Original price $ 457.00Original price $ 457.00 - Original price $ 457.00Original price $ 457.00Current price $ 366.00$ 366.00 - $ 366.00Current price $ 366.00
Foster FM3103HW, 1/4" Industrial Coupler x 1/4" Male NPT, 3 Series, Automatic, Hot Water/Viton, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster FM3103HW is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — ...
View full detailsOriginal price $ 457.00Original price $ 457.00 - Original price $ 457.00Original price $ 457.00Current price $ 366.00$ 366.00 - $ 366.00Current price $ 366.00Save 20% -
Original price $ 405.00Original price $ 405.00 - Original price $ 405.00Original price $ 405.00Current price $ 324.00$ 324.00 - $ 324.00Current price $ 324.00
Foster FM3103H, 1/4" Industrial Coupler x 1/4" Male NPT, 3 Series, Automatic, Heat/Viton, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster FM3103H is a Brass 1/4" industrial coupler from the Foster 3 Series — the ...
View full detailsOriginal price $ 405.00Original price $ 405.00 - Original price $ 405.00Original price $ 405.00Current price $ 324.00$ 324.00 - $ 324.00Current price $ 324.00Save 20% -
Original price $ 493.00Original price $ 493.00 - Original price $ 493.00Original price $ 493.00Current price $ 394.00$ 394.00 - $ 394.00Current price $ 394.00
Foster SL3103D, 1/4" Industrial Coupler x 1/4" Male NPT, 3 Series, Automatic Sleeve Lock, Dill Valve, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SL3103D is a Brass 1/4" industrial coupler from the Foster 3 Series — the ...
View full detailsOriginal price $ 493.00Original price $ 493.00 - Original price $ 493.00Original price $ 493.00Current price $ 394.00$ 394.00 - $ 394.00Current price $ 394.00Save 20% -
Original price $ 401.00Original price $ 401.00 - Original price $ 401.00Original price $ 401.00Current price $ 321.00$ 321.00 - $ 321.00Current price $ 321.00
Foster FM3103D, 1/4" Industrial Coupler x 1/4" Male NPT, 3 Series, Automatic, Dill Valve, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster FM3103D is a Brass 1/4" industrial coupler from the Foster 3 Series — the ...
View full detailsOriginal price $ 401.00Original price $ 401.00 - Original price $ 401.00Original price $ 401.00Current price $ 321.00$ 321.00 - $ 321.00Current price $ 321.00Save 20% -
Original price $ 453.00Original price $ 453.00 - Original price $ 453.00Original price $ 453.00Current price $ 362.00$ 362.00 - $ 362.00Current price $ 362.00
Foster SL3103, 1/4" Industrial Coupler x 1/4" Male NPT, 3 Series, Automatic Sleeve Lock, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SL3103 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price $ 453.00Original price $ 453.00 - Original price $ 453.00Original price $ 453.00Current price $ 362.00$ 362.00 - $ 362.00Current price $ 362.00Save 20% -
Original price $ 394.00Original price $ 394.00 - Original price $ 394.00Original price $ 394.00Current price $ 315.00$ 315.00 - $ 315.00Current price $ 315.00
Foster FM3103, 1/4" Industrial Coupler x 1/4" Male NPT, 3 Series, Automatic, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster FM3103 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price $ 394.00Original price $ 394.00 - Original price $ 394.00Original price $ 394.00Current price $ 315.00$ 315.00 - $ 315.00Current price $ 315.00Save 20% -
Original price $ 475.00Original price $ 475.00 - Original price $ 475.00Original price $ 475.00Current price $ 380.00$ 380.00 - $ 380.00Current price $ 380.00
Foster SL2903, 1/4" Industrial Coupler x 1/8" Male NPT, 3 Series, Automatic Sleeve Lock, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SL2903 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price $ 475.00Original price $ 475.00 - Original price $ 475.00Original price $ 475.00Current price $ 380.00$ 380.00 - $ 380.00Current price $ 380.00Save 20% -
Original price $ 387.00Original price $ 387.00 - Original price $ 387.00Original price $ 387.00Current price $ 310.00$ 310.00 - $ 310.00Current price $ 310.00
Foster FM2903, 1/4" Industrial Coupler x 1/8" Male NPT, 3 Series, Automatic, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster FM2903 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price $ 387.00Original price $ 387.00 - Original price $ 387.00Original price $ 387.00Current price $ 310.00$ 310.00 - $ 310.00Current price $ 310.00Save 20% -
Original price $ 478.00Original price $ 478.00 - Original price $ 478.00Original price $ 478.00Current price $ 383.00$ 383.00 - $ 383.00Current price $ 383.00
Foster FM3203W, 1/4" Industrial Coupler x 3/8" Female NPT, 3 Series, Automatic, Water, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster FM3203W is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — t...
View full detailsOriginal price $ 478.00Original price $ 478.00 - Original price $ 478.00Original price $ 478.00Current price $ 383.00$ 383.00 - $ 383.00Current price $ 383.00Save 20% -
Original price $ 425.00Original price $ 425.00 - Original price $ 425.00Original price $ 425.00Current price $ 340.00$ 340.00 - $ 340.00Current price $ 340.00
Foster FM3203H, 1/4" Industrial Coupler x 3/8" Female NPT, 3 Series, Automatic, Heat/Viton, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster FM3203H is a Brass 1/4" industrial coupler from the Foster 3 Series — the ...
View full detailsOriginal price $ 425.00Original price $ 425.00 - Original price $ 425.00Original price $ 425.00Current price $ 340.00$ 340.00 - $ 340.00Current price $ 340.00Save 20% -
Original price $ 421.00Original price $ 421.00 - Original price $ 421.00Original price $ 421.00Current price $ 337.00$ 337.00 - $ 337.00Current price $ 337.00
Foster SL3203, 1/4" Industrial Coupler x 3/8" Female NPT, 3 Series, Automatic Sleeve Lock, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SL3203 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price $ 421.00Original price $ 421.00 - Original price $ 421.00Original price $ 421.00Current price $ 337.00$ 337.00 - $ 337.00Current price $ 337.00Save 20% -
Original price $ 398.00Original price $ 398.00 - Original price $ 398.00Original price $ 398.00Current price $ 319.00$ 319.00 - $ 319.00Current price $ 319.00
Foster FM3203, 1/4" Industrial Coupler x 3/8" Female NPT, 3 Series, Automatic, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster FM3203 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price $ 398.00Original price $ 398.00 - Original price $ 398.00Original price $ 398.00Current price $ 319.00$ 319.00 - $ 319.00Current price $ 319.00Save 20% -
Original price $ 514.00Original price $ 514.00 - Original price $ 514.00Original price $ 514.00Current price $ 412.00$ 412.00 - $ 412.00Current price $ 412.00
Foster SL3003W, 1/4" Industrial Coupler x 1/4" Female NPT, 3 Series, Automatic Sleeve Lock, Water, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SL3003W is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — t...
View full detailsOriginal price $ 514.00Original price $ 514.00 - Original price $ 514.00Original price $ 514.00Current price $ 412.00$ 412.00 - $ 412.00Current price $ 412.00Save 20% -
Original price $ 450.00Original price $ 450.00 - Original price $ 450.00Original price $ 450.00Current price $ 360.00$ 360.00 - $ 360.00Current price $ 360.00
Foster FM3003W, 1/4" Industrial Coupler x 1/4" Female NPT, 3 Series, Automatic, Water, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster FM3003W is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — t...
View full detailsOriginal price $ 450.00Original price $ 450.00 - Original price $ 450.00Original price $ 450.00Current price $ 360.00$ 360.00 - $ 360.00Current price $ 360.00Save 20% -
Original price $ 446.00Original price $ 446.00 - Original price $ 446.00Original price $ 446.00Current price $ 357.00$ 357.00 - $ 357.00Current price $ 357.00
Foster FM3003S, 1/4" Industrial Coupler x 1/4" Female NPT, 3 Series, Automatic, Steam/EPDM, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster FM3003S is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — t...
View full detailsOriginal price $ 446.00Original price $ 446.00 - Original price $ 446.00Original price $ 446.00Current price $ 357.00$ 357.00 - $ 357.00Current price $ 357.00Save 20% -
Original price $ 450.00Original price $ 450.00 - Original price $ 450.00Original price $ 450.00Current price $ 360.00$ 360.00 - $ 360.00Current price $ 360.00
Foster FM3003HW, 1/4" Industrial Coupler x 1/4" Female NPT, 3 Series, Automatic, Hot Water/Viton, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster FM3003HW is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — ...
View full detailsOriginal price $ 450.00Original price $ 450.00 - Original price $ 450.00Original price $ 450.00Current price $ 360.00$ 360.00 - $ 360.00Current price $ 360.00Save 20% -
Original price $ 407.00Original price $ 407.00 - Original price $ 407.00Original price $ 407.00Current price $ 326.00$ 326.00 - $ 326.00Current price $ 326.00
Foster SL3003, 1/4" Industrial Coupler x 1/4" Female NPT, 3 Series, Automatic Sleeve Lock, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SL3003 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price $ 407.00Original price $ 407.00 - Original price $ 407.00Original price $ 407.00Current price $ 326.00$ 326.00 - $ 326.00Current price $ 326.00Save 20%
