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.
-
Original price $ 383.00Original price $ 383.00 - Original price $ 383.00Original price $ 383.00Current price $ 306.00$ 306.00 - $ 306.00Current price $ 306.00
Foster FM3003, 1/4" Industrial Coupler x 1/4" Female NPT, 3 Series, Automatic, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster FM3003 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price $ 383.00Original price $ 383.00 - Original price $ 383.00Original price $ 383.00Current price $ 306.00$ 306.00 - $ 306.00Current price $ 306.00Save 20% -
Original price $ 440.00Original price $ 440.00 - Original price $ 440.00Original price $ 440.00Current price $ 352.00$ 352.00 - $ 352.00Current price $ 352.00
Foster FM2803W, 1/4" Industrial Coupler x 1/8" Female NPT, 3 Series, Automatic, Water, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster FM2803W is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — t...
View full detailsOriginal price $ 440.00Original price $ 440.00 - Original price $ 440.00Original price $ 440.00Current price $ 352.00$ 352.00 - $ 352.00Current price $ 352.00Save 20% -
Original price $ 429.00Original price $ 429.00 - Original price $ 429.00Original price $ 429.00Current price $ 343.00$ 343.00 - $ 343.00Current price $ 343.00
Foster SL2803, 1/4" Industrial Coupler x 1/8" Female NPT, 3 Series, Automatic Sleeve Lock, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SL2803 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price $ 429.00Original price $ 429.00 - Original price $ 429.00Original price $ 429.00Current price $ 343.00$ 343.00 - $ 343.00Current price $ 343.00Save 20% -
Original price $ 475.00Original price $ 475.00 - Original price $ 475.00Original price $ 475.00Current price $ 381.00$ 381.00 - $ 381.00Current price $ 381.00
Foster FM2803S, 1/4" Industrial Coupler x 1/8" Female NPT, 3 Series, Automatic, Steam/EPDM, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster FM2803S is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — t...
View full detailsOriginal price $ 475.00Original price $ 475.00 - Original price $ 475.00Original price $ 475.00Current price $ 381.00$ 381.00 - $ 381.00Current price $ 381.00Save 20% -
Original price $ 416.00Original price $ 416.00 - Original price $ 416.00Original price $ 416.00Current price $ 334.00$ 334.00 - $ 334.00Current price $ 334.00
Foster FM2803, 1/4" Industrial Coupler x 1/8" Female NPT, 3 Series, Automatic, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster FM2803 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price $ 416.00Original price $ 416.00 - Original price $ 416.00Original price $ 416.00Current price $ 334.00$ 334.00 - $ 334.00Current price $ 334.00Save 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 SG3703, 1/4" Industrial Coupler x 3/8" Hose ID, 3 Series, Sleeve Guard, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SG3703 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...
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 $ 241.00Original price $ 241.00 - Original price $ 241.00Original price $ 241.00Current price $ 193.00$ 193.00 - $ 193.00Current price $ 193.00
Foster SG3603, 1/4" Industrial Coupler x 1/4" Hose ID, 3 Series, Sleeve Guard, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SG3603 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price $ 241.00Original price $ 241.00 - Original price $ 241.00Original price $ 241.00Current price $ 193.00$ 193.00 - $ 193.00Current price $ 193.00Save 20% -
Original price $ 270.00Original price $ 270.00 - Original price $ 270.00Original price $ 270.00Current price $ 216.00$ 216.00 - $ 216.00Current price $ 216.00
Foster SG1713, 1/4" Industrial Coupler x 3/8" Push-On Hose Stem, 3 Series, Sleeve Guard, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SG1713 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price $ 270.00Original price $ 270.00 - Original price $ 270.00Original price $ 270.00Current price $ 216.00$ 216.00 - $ 216.00Current price $ 216.00Save 20% -
Original price $ 266.00Original price $ 266.00 - Original price $ 266.00Original price $ 266.00Current price $ 213.00$ 213.00 - $ 213.00Current price $ 213.00
Foster SG1513, 1/4" Industrial Coupler x 1/4" Push-On Hose Stem, 3 Series, Sleeve Guard, Brass
In stockReliable, 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...
View full detailsOriginal price $ 266.00Original price $ 266.00 - Original price $ 266.00Original price $ 266.00Current price $ 213.00$ 213.00 - $ 213.00Current price $ 213.00Save 20% -
Original price $ 252.00Original price $ 252.00 - Original price $ 252.00Original price $ 252.00Current price $ 200.00$ 200.00 - $ 200.00Current price $ 200.00
Foster SG3303, 1/4" Industrial Coupler x 3/8" Male NPT, 3 Series, Sleeve Guard, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SG3303 is a Brass 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 $ 200.00$ 200.00 - $ 200.00Current price $ 200.00Save 21% -
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 SG3103D, 1/4" Industrial Coupler x 1/4" Male NPT, 3 Series, Sleeve Guard, Dill Valve, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SG3103D is a Brass 1/4" industrial coupler from the Foster 3 Series — the ...
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 $ 232.00Original price $ 232.00 - Original price $ 232.00Original price $ 232.00Current price $ 186.00$ 186.00 - $ 186.00Current price $ 186.00
Foster SG3103, 1/4" Industrial Coupler x 1/4" Male NPT, 3 Series, Sleeve Guard, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SG3103 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price $ 232.00Original price $ 232.00 - Original price $ 232.00Original price $ 232.00Current price $ 186.00$ 186.00 - $ 186.00Current price $ 186.00Save 20% -
Original price $ 316.00Original price $ 316.00 - Original price $ 316.00Original price $ 316.00Current price $ 252.00$ 252.00 - $ 252.00Current price $ 252.00
Foster SG2903, 1/4" Industrial Coupler x 1/8" Male NPT, 3 Series, Sleeve Guard, Brass
In stockReliable, 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...
View full detailsOriginal price $ 316.00Original price $ 316.00 - Original price $ 316.00Original price $ 316.00Current price $ 252.00$ 252.00 - $ 252.00Current price $ 252.00Save 20% -
Original price $ 249.00Original price $ 249.00 - Original price $ 249.00Original price $ 249.00Current price $ 199.00$ 199.00 - $ 199.00Current price $ 199.00
Foster SG3203, 1/4" Industrial Coupler x 3/8" Female NPT, 3 Series, Sleeve Guard, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SG3203 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price $ 249.00Original price $ 249.00 - Original price $ 249.00Original price $ 249.00Current price $ 199.00$ 199.00 - $ 199.00Current price $ 199.00Save 20% -
Original price $ 209.00Original price $ 209.00 - Original price $ 209.00Original price $ 209.00Current price $ 168.00$ 168.00 - $ 168.00Current price $ 168.00
Foster SG3003LV, 1/4" Industrial Coupler x 1/4" Female NPT, 3 Series, Sleeve Guard, Less Valve, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SG3003LV is a Brass 1/4" industrial coupler from the Foster 3 Series — the...
View full detailsOriginal price $ 209.00Original price $ 209.00 - Original price $ 209.00Original price $ 209.00Current price $ 168.00$ 168.00 - $ 168.00Current price $ 168.00Save 20% -
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 SG3003, 1/4" Industrial Coupler x 1/4" Female NPT, 3 Series, Sleeve Guard, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SG3003 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...
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 $ 384.00Original price $ 384.00 - Original price $ 384.00Original price $ 384.00Current price $ 308.00$ 308.00 - $ 308.00Current price $ 308.00
Foster SG2803, 1/4" Industrial Coupler x 1/8" Female NPT, 3 Series, Sleeve Guard, Brass
In stockReliable, 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...
View full detailsOriginal price $ 384.00Original price $ 384.00 - Original price $ 384.00Original price $ 384.00Current price $ 308.00$ 308.00 - $ 308.00Current price $ 308.00Save 20% -
Original price $ 90.00Original price $ 90.00 - Original price $ 90.00Original price $ 90.00Current price $ 72.00$ 72.00 - $ 72.00Current price $ 72.00
Foster 3SDC, 1/4" 3 Series Socket Dust Cap, Steel
In stockProtect your 1/4" 3 Series quick sockets when not in use. The Foster 3SDC dust cap keeps dirt, chips, and moisture out of the coupling, helping pre...
View full detailsOriginal price $ 90.00Original price $ 90.00 - Original price $ 90.00Original price $ 90.00Current price $ 72.00$ 72.00 - $ 72.00Current price $ 72.00Save 20% -
Original price $ 434.00Original price $ 434.00 - Original price $ 434.00Original price $ 434.00Current price $ 349.00$ 349.00 - $ 349.00Current price $ 349.00
Foster BLSD13-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 3/8" ID x 13/16" OD, 3 Series, Ball Lock, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster BLSD13-3 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series...
View full detailsOriginal price $ 434.00Original price $ 434.00 - Original price $ 434.00Original price $ 434.00Current price $ 349.00$ 349.00 - $ 349.00Current price $ 349.00Save 20% -
Original price $ 402.00Original price $ 402.00 - Original price $ 402.00Original price $ 402.00Current price $ 322.00$ 322.00 - $ 322.00Current price $ 322.00
Foster SD13-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 3/8" ID x 13/16" OD, 3 Series, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SD13-3 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series —...
View full detailsOriginal price $ 402.00Original price $ 402.00 - Original price $ 402.00Original price $ 402.00Current price $ 322.00$ 322.00 - $ 322.00Current price $ 322.00Save 20% -
Original price $ 427.00Original price $ 427.00 - Original price $ 427.00Original price $ 427.00Current price $ 341.00$ 341.00 - $ 341.00Current price $ 341.00
Foster BLSD11-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 3/8" ID x 3/4" OD, 3 Series, Ball Lock, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster BLSD11-3 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series...
View full detailsOriginal price $ 427.00Original price $ 427.00 - Original price $ 427.00Original price $ 427.00Current price $ 341.00$ 341.00 - $ 341.00Current price $ 341.00Save 20% -
Original price $ 395.00Original price $ 395.00 - Original price $ 395.00Original price $ 395.00Current price $ 316.00$ 316.00 - $ 316.00Current price $ 316.00
Foster SD11-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 3/8" ID x 3/4" OD, 3 Series, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SD11-3 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series —...
View full detailsOriginal price $ 395.00Original price $ 395.00 - Original price $ 395.00Original price $ 395.00Current price $ 316.00$ 316.00 - $ 316.00Current price $ 316.00Save 20% -
Original price $ 393.00Original price $ 393.00 - Original price $ 393.00Original price $ 393.00Current price $ 315.00$ 315.00 - $ 315.00Current price $ 315.00
Foster BLSD9-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 3/8" ID x 11/16" OD, 3 Series, Ball Lock, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster BLSD9-3 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series ...
View full detailsOriginal price $ 393.00Original price $ 393.00 - Original price $ 393.00Original price $ 393.00Current price $ 315.00$ 315.00 - $ 315.00Current price $ 315.00Save 20% -
Original price $ 366.00Original price $ 366.00 - Original price $ 366.00Original price $ 366.00Current price $ 293.00$ 293.00 - $ 293.00Current price $ 293.00
Foster SD9-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 3/8" ID x 11/16" OD, 3 Series, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SD9-3 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series — ...
View full detailsOriginal price $ 366.00Original price $ 366.00 - Original price $ 366.00Original price $ 366.00Current price $ 293.00$ 293.00 - $ 293.00Current price $ 293.00Save 20%
