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 $ 383.00Original price $ 383.00 - Original price $ 383.00Original price $ 383.00Current price $ 306.00$ 306.00 - $ 306.00Current price $ 306.00
Foster FM3003, 3 Series, Industrial Coupler, Automatic, 1/4" Female NPT, 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 $ 43.00Original price $ 43.00 - Original price $ 43.00Original price $ 43.00Current price $ 34.00$ 34.00 - $ 34.00Current price $ 34.00
Foster 10-3, 3 Series, Industrial Plug, 1/4" Male NPT, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 10-3 is a Steel 1/4" industrial plug from the Foster 3 Series — the most p...
View full detailsOriginal price $ 43.00Original price $ 43.00 - Original price $ 43.00Original price $ 43.00Current price $ 34.00$ 34.00 - $ 34.00Current price $ 34.00Save 21% -
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, 3 Series, Industrial Coupler, Manual, 1/4" Female NPT, 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 $ 68.00Original price $ 68.00 - Original price $ 68.00Original price $ 68.00Current price $ 56.00$ 56.00 - $ 56.00Current price $ 56.00
Foster 10-3B, 3 Series, Industrial Plug, 1/4" Male NPT, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 10-3B is a Brass 1/4" industrial plug from the Foster 3 Series — the most ...
View full detailsOriginal price $ 68.00Original price $ 68.00 - Original price $ 68.00Original price $ 68.00Current price $ 56.00$ 56.00 - $ 56.00Current price $ 56.00Save 18% -
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, 3 Series, Industrial Coupler, Manual, 1/4" Male NPT, 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 $ 49.00Original price $ 49.00 - Original price $ 49.00Original price $ 49.00Current price $ 40.00$ 40.00 - $ 40.00Current price $ 40.00
Foster 11-3, 3 Series, Industrial Plug, 1/4" Female NPT, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 11-3 is a Steel 1/4" industrial plug from the Foster 3 Series — the most p...
View full detailsOriginal price $ 49.00Original price $ 49.00 - Original price $ 49.00Original price $ 49.00Current price $ 40.00$ 40.00 - $ 40.00Current price $ 40.00Save 18% -
Original price $ 52.00Original price $ 52.00 - Original price $ 52.00Original price $ 52.00Current price $ 41.00$ 41.00 - $ 41.00Current price $ 41.00
Foster 12-3, 3 Series, Industrial Plug, 1/8" Male NPT, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 12-3 is a Steel 1/4" industrial plug from the Foster 3 Series — the most p...
View full detailsOriginal price $ 52.00Original price $ 52.00 - Original price $ 52.00Original price $ 52.00Current price $ 41.00$ 41.00 - $ 41.00Current price $ 41.00Save 21% -
Original price $ 61.00Original price $ 61.00 - Original price $ 61.00Original price $ 61.00Current price $ 49.00$ 49.00 - $ 49.00Current price $ 49.00
Foster 16-3, 3 Series, Industrial Plug, 1/4" Hose Barb, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 16-3 is a Steel 1/4" industrial plug from the Foster 3 Series — the most p...
View full detailsOriginal price $ 61.00Original price $ 61.00 - Original price $ 61.00Original price $ 61.00Current price $ 49.00$ 49.00 - $ 49.00Current price $ 49.00Save 20% -
Original price $ 86.00Original price $ 86.00 - Original price $ 86.00Original price $ 86.00Current price $ 68.00$ 68.00 - $ 68.00Current price $ 68.00
Foster 11-3B, 3 Series, Industrial Plug, 1/4" Female NPT, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 11-3B is a Brass 1/4" industrial plug from the Foster 3 Series — the most ...
View full detailsOriginal price $ 86.00Original price $ 86.00 - Original price $ 86.00Original price $ 86.00Current price $ 68.00$ 68.00 - $ 68.00Current price $ 68.00Save 21% -
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 FM3103, 3 Series, Industrial Coupler, Automatic, 1/4" Male NPT, 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 $ 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 $ 420.00Original price $ 420.00 - Original price $ 420.00Original price $ 420.00Current price $ 336.00$ 336.00 - $ 336.00Current price $ 336.00
Foster 3003GB, 3 Series, Industrial Coupler, Automatic, 1/4" Female NPT, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3003GB is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price $ 420.00Original price $ 420.00 - Original price $ 420.00Original price $ 420.00Current price $ 336.00$ 336.00 - $ 336.00Current price $ 336.00Save 20% -
Original price $ 233.00Original price $ 233.00 - Original price $ 233.00Original price $ 233.00Current price $ 186.00$ 186.00 - $ 186.00Current price $ 186.00
Foster SG3103, 3 Series, Industrial Coupler, Manual, Sleeve Guard, 1/4" Male NPT, 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 $ 233.00Original price $ 233.00 - Original price $ 233.00Original price $ 233.00Current price $ 186.00$ 186.00 - $ 186.00Current price $ 186.00Save 20% -
Original price $ 100.00Original price $ 100.00 - Original price $ 100.00Original price $ 100.00Current price $ 81.00$ 81.00 - $ 81.00Current price $ 81.00
Foster 13-3B, 3 Series, Industrial Plug, 1/8" Female NPT, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 13-3B is a Brass 1/4" industrial plug from the Foster 3 Series — the most ...
View full detailsOriginal price $ 100.00Original price $ 100.00 - Original price $ 100.00Original price $ 100.00Current price $ 81.00$ 81.00 - $ 81.00Current price $ 81.00Save 19% -
Original price $ 131.00Original price $ 131.00 - Original price $ 131.00Original price $ 131.00Current price $ 106.00$ 106.00 - $ 106.00Current price $ 106.00
Foster 17-3B, 3 Series, Industrial Plug, 3/8" Hose Barb, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 17-3B is a Brass 1/4" industrial plug from the Foster 3 Series — the most ...
View full detailsOriginal price $ 131.00Original price $ 131.00 - Original price $ 131.00Original price $ 131.00Current price $ 106.00$ 106.00 - $ 106.00Current price $ 106.00Save 19% -
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 3003GS, 3 Series, Industrial Coupler, Automatic, 1/4" Female NPT, Brass, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3003GS is a Steel 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 $ 68.00Original price $ 68.00 - Original price $ 68.00Original price $ 68.00Current price $ 54.00$ 54.00 - $ 54.00Current price $ 54.00
Foster 17-3, 3 Series, Industrial Plug, 3/8" Hose Barb, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 17-3 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 $ 258.00Original price $ 258.00 - Original price $ 258.00Original price $ 258.00Current price $ 206.00$ 206.00 - $ 206.00Current price $ 206.00
Foster 3603, 3 Series, Industrial Coupler, Manual, 1/4" Hose Barb, Brass, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3603 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series — t...
View full detailsOriginal price $ 258.00Original price $ 258.00 - Original price $ 258.00Original price $ 258.00Current price $ 206.00$ 206.00 - $ 206.00Current price $ 206.00Save 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 FM3203, 3 Series, Industrial Coupler, Automatic, 3/8" Female NPT, 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 $ 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 $ 231.00Original price $ 231.00 - Original price $ 231.00Original price $ 231.00Current price $ 184.00$ 184.00 - $ 184.00Current price $ 184.00
Foster SG3003, 3 Series, Industrial Coupler, Manual, Sleeve Guard, 1/4" Female NPT, 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 $ 268.00Original price $ 268.00 - Original price $ 268.00Original price $ 268.00Current price $ 215.00$ 215.00 - $ 215.00Current price $ 215.00
Foster 3303, 3 Series, Industrial Coupler, Manual, 3/8" Male NPT, Brass, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3303 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 $ 281.00Original price $ 281.00 - Original price $ 281.00Original price $ 281.00Current price $ 225.00$ 225.00 - $ 225.00Current price $ 225.00
Foster 3703, 3 Series, Industrial Coupler, Manual, 3/8" Hose Barb, Brass, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3703 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series — t...
View full detailsOriginal price $ 281.00Original price $ 281.00 - Original price $ 281.00Original price $ 281.00Current price $ 225.00$ 225.00 - $ 225.00Current price $ 225.00Save 20% -
Original price $ 356.00Original price $ 356.00 - Original price $ 356.00Original price $ 356.00Current price $ 284.00$ 284.00 - $ 284.00Current price $ 284.00
Foster 3003HW, 3 Series, Industrial Coupler, Manual, 1/4" Female NPT, Brass (HOT WATER)
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 $ 284.00$ 284.00 - $ 284.00Current price $ 284.00Save 20% -
Original price $ 400.00Original price $ 400.00 - Original price $ 400.00Original price $ 400.00Current price $ 320.00$ 320.00 - $ 320.00Current price $ 320.00
Foster FM3303, 3 Series, Industrial Coupler, Automatic, 3/8" Male NPT, 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 $ 400.00Original price $ 400.00 - Original price $ 400.00Original price $ 400.00Current price $ 320.00$ 320.00 - $ 320.00Current price $ 320.00Save 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, 3 Series, Industrial Coupler, Manual, Sleeve Guard, 1/4" Hose Barb, 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%
