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 $ 59.00Original price $ 59.00 - Original price $ 59.00Original price $ 59.00Current price $ 47.00$ 47.00 - $ 47.00Current price $ 47.00
Foster 13-3, 3 Series, Industrial Plug, 1/8" Female NPT, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 13-3 is a Steel 1/4" industrial plug from the Foster 3 Series — the most p...
View full detailsOriginal price $ 59.00Original price $ 59.00 - Original price $ 59.00Original price $ 59.00Current price $ 47.00$ 47.00 - $ 47.00Current price $ 47.00Save 20% -
Original price $ 152.00Original price $ 152.00 - Original price $ 152.00Original price $ 152.00Current price $ 122.00$ 122.00 - $ 122.00Current price $ 122.00
Foster 165-3, 3 Series, Industrial Plug, 5/16" Hose Barb, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 165-3 is a Steel 1/4" industrial plug from the Foster 3 Series — the most ...
View full detailsOriginal price $ 152.00Original price $ 152.00 - Original price $ 152.00Original price $ 152.00Current price $ 122.00$ 122.00 - $ 122.00Current price $ 122.00Save 20% -
Original price $ 404.00Original price $ 404.00 - Original price $ 404.00Original price $ 404.00Current price $ 324.00$ 324.00 - $ 324.00Current price $ 324.00
Foster 3603GS, 3 Series, Industrial Coupler, Automatic, 1/4" Hose Barb, Brass, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3603GS is a Steel 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price $ 404.00Original price $ 404.00 - Original price $ 404.00Original price $ 404.00Current price $ 324.00$ 324.00 - $ 324.00Current price $ 324.00Save 20% -
Original price $ 270.00Original price $ 270.00 - Original price $ 270.00Original price $ 270.00Current price $ 217.00$ 217.00 - $ 217.00Current price $ 217.00
Foster SG1713, 3 Series, Industrial Coupler, Manual, Sleeve Guard, 3/8" Push-On Hose Barb, 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 $ 217.00$ 217.00 - $ 217.00Current price $ 217.00Save 20% -
Original price $ 83.00Original price $ 83.00 - Original price $ 83.00Original price $ 83.00Current price $ 66.00$ 66.00 - $ 66.00Current price $ 66.00
Foster 71-3, 3 Series, Industrial Plug, 3/8" Hose Barb (Push-On), Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 71-3 is a Steel 1/4" industrial plug from the Foster 3 Series — the most p...
View full detailsOriginal price $ 83.00Original price $ 83.00 - Original price $ 83.00Original price $ 83.00Current price $ 66.00$ 66.00 - $ 66.00Current price $ 66.00Save 20% -
Original price $ 1,178.00Original price $ 1,178.00 - Original price $ 1,178.00Original price $ 1,178.00Current price $ 942.00$ 942.00 - $ 942.00Current price $ 942.00
Foster 3303S/S, 3 Series, Industrial Coupler, Manual, 3/8" Male NPT, Stainless Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3303S/S is a 303 Stainless 1/4" industrial coupler from the Foster 3 Serie...
View full detailsOriginal price $ 1,178.00Original price $ 1,178.00 - Original price $ 1,178.00Original price $ 1,178.00Current price $ 942.00$ 942.00 - $ 942.00Current price $ 942.00Save 20% -
Original price $ 522.00Original price $ 522.00 - Original price $ 522.00Original price $ 522.00Current price $ 419.00$ 419.00 - $ 419.00Current price $ 419.00
Foster 3203GB, 3 Series, Industrial Coupler, Automatic, 3/8" Female NPT, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3203GB is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price $ 522.00Original price $ 522.00 - Original price $ 522.00Original price $ 522.00Current price $ 419.00$ 419.00 - $ 419.00Current price $ 419.00Save 20% -
Original price $ 406.00Original price $ 406.00 - Original price $ 406.00Original price $ 406.00Current price $ 326.00$ 326.00 - $ 326.00Current price $ 326.00
Foster SL3003, 3 Series, Industrial Coupler, Automatic, 1/4" Female NPT, Brass With Ball Sleeve Lock
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 $ 406.00Original price $ 406.00 - Original price $ 406.00Original price $ 406.00Current price $ 326.00$ 326.00 - $ 326.00Current price $ 326.00Save 20% -
Original price $ 143.00Original price $ 143.00 - Original price $ 143.00Original price $ 143.00Current price $ 115.00$ 115.00 - $ 115.00Current price $ 115.00
Foster 16-3B, 3 Series, Industrial Plug, 1/4" Hose Barb, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 16-3B is a Brass 1/4" industrial plug from the Foster 3 Series — the most ...
View full detailsOriginal price $ 143.00Original price $ 143.00 - Original price $ 143.00Original price $ 143.00Current price $ 115.00$ 115.00 - $ 115.00Current price $ 115.00Save 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, 3 Series, Industrial Coupler, Manual, Sleeve Guard, 3/8" Female NPT, 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 $ 252.00Original price $ 252.00 - Original price $ 252.00Original price $ 252.00Current price $ 201.00$ 201.00 - $ 201.00Current price $ 201.00
Foster SG3303, 3 Series, Industrial Coupler, Manual, Sleeve Guard, 3/8" Male NPT, 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 $ 201.00$ 201.00 - $ 201.00Current price $ 201.00Save 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, 3 Series, Industrial Coupler, Manual, 1/4" Female NPT, Stainless Steel
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 $ 90.00Original price $ 90.00 - Original price $ 90.00Original price $ 90.00Current price $ 72.00$ 72.00 - $ 72.00Current price $ 72.00
Foster 12-3B, 3 Series, Industrial Plug, 1/8" Male NPT, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 12-3B is a Brass 1/4" industrial plug from the Foster 3 Series — the most ...
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 $ 478.00Original price $ 478.00 - Original price $ 478.00Original price $ 478.00Current price $ 383.00$ 383.00 - $ 383.00Current price $ 383.00
Foster 3103GB, 3 Series, Industrial Coupler, Automatic, 1/4" Male NPT, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3103GB is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...
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 $ 531.00Original price $ 531.00 - Original price $ 531.00Original price $ 531.00Current price $ 424.00$ 424.00 - $ 424.00Current price $ 424.00
Foster 3703GB, 3 Series, Industrial Coupler, Automatic, 3/8" Hose Barb, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3703GB is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price $ 531.00Original price $ 531.00 - Original price $ 531.00Original price $ 531.00Current price $ 424.00$ 424.00 - $ 424.00Current price $ 424.00Save 20% -
Original price $ 68.00Original price $ 68.00 - Original price $ 68.00Original price $ 68.00Current price $ 54.00$ 54.00 - $ 54.00Current price $ 54.00
Foster 14-3, 3 Series, Industrial Plug, 3/8" Male NPT, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 14-3 is a Steel 1/4" industrial plug from the Foster 3 Series — the most p...
View full detailsOriginal price $ 68.00Original price $ 68.00 - Original price $ 68.00Original price $ 68.00Current price $ 54.00$ 54.00 - $ 54.00Current price $ 54.00Save 21% -
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, 3 Series, Industrial Coupler, Manual, 3/8" Female NPT, 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 $ 104.00Original price $ 104.00 - Original price $ 104.00Original price $ 104.00Current price $ 83.00$ 83.00 - $ 83.00Current price $ 83.00
Foster 15-3, 3 Series, Industrial Plug, 3/8" Female NPT, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 15-3 is a Steel 1/4" industrial plug from the Foster 3 Series — the most p...
View full detailsOriginal price $ 104.00Original price $ 104.00 - Original price $ 104.00Original price $ 104.00Current price $ 83.00$ 83.00 - $ 83.00Current price $ 83.00Save 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 FM1713, 3 Series, Industrial Coupler, Automatic, 3/8" Push-On Hose Barb, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster FM1713 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 $ 408.00Original price $ 408.00 - Original price $ 408.00Original price $ 408.00Current price $ 327.00$ 327.00 - $ 327.00Current price $ 327.00
Foster FM3603, 3 Series, Industrial Coupler, Automatic, 1/4" Hose Barb, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster FM3603 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price $ 408.00Original price $ 408.00 - Original price $ 408.00Original price $ 408.00Current price $ 327.00$ 327.00 - $ 327.00Current price $ 327.00Save 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 FM3703, 3 Series, Industrial Coupler, Automatic, 3/8" Hose Barb, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster FM3703 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...
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 $ 243.00Original price $ 243.00 - Original price $ 243.00Original price $ 243.00Current price $ 195.00$ 195.00 - $ 195.00Current price $ 195.00
Foster SG3703, 3 Series, Industrial Coupler, Manual, Sleeve Guard, 3/8" Hose Barb, 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 $ 290.00Original price $ 290.00 - Original price $ 290.00Original price $ 290.00Current price $ 231.00$ 231.00 - $ 231.00Current price $ 231.00
Foster 1713, 3 Series, Industrial Coupler, Manual, 3/8" Hose Barb (Push-On), Brass, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 1713 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series — t...
View full detailsOriginal price $ 290.00Original price $ 290.00 - Original price $ 290.00Original price $ 290.00Current price $ 231.00$ 231.00 - $ 231.00Current price $ 231.00Save 20% -
Original price $ 168.00Original price $ 168.00 - Original price $ 168.00Original price $ 168.00Current price $ 134.00$ 134.00 - $ 134.00Current price $ 134.00
Foster 14-3B, 3 Series, Industrial Plug, 3/8" Male NPT, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 14-3B is a Brass 1/4" industrial plug from the Foster 3 Series — the most ...
View full detailsOriginal price $ 168.00Original price $ 168.00 - Original price $ 168.00Original price $ 168.00Current price $ 134.00$ 134.00 - $ 134.00Current price $ 134.00Save 20%
