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 $ 93.00Original price $ 93.00 - Original price $ 93.00Original price $ 93.00Current price $ 74.00$ 74.00 - $ 74.00Current price $ 74.00
Foster 51-3, 3 Series, Industrial Plug, 1/4" Hose Barb (Push-On), Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 51-3 is a Steel 1/4" industrial plug from the Foster 3 Series — the most p...
View full detailsOriginal price $ 93.00Original price $ 93.00 - Original price $ 93.00Original price $ 93.00Current price $ 74.00$ 74.00 - $ 74.00Current price $ 74.00Save 20% -
Original price $ 224.00Original price $ 224.00 - Original price $ 224.00Original price $ 224.00Current price $ 179.00$ 179.00 - $ 179.00Current price $ 179.00
Foster 12-3S/S, 3 Series, Industrial Plug, 1/8" Male NPT, Stainless Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 12-3S/S is a 303 Stainless 1/4" industrial plug from the Foster 3 Series —...
View full detailsOriginal price $ 224.00Original price $ 224.00 - Original price $ 224.00Original price $ 224.00Current price $ 179.00$ 179.00 - $ 179.00Current price $ 179.00Save 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, 3 Series, Industrial Coupler, Manual, 1/8" Female NPT, 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% -
Original price $ 293.00Original price $ 293.00 - Original price $ 293.00Original price $ 293.00Current price $ 236.00$ 236.00 - $ 236.00Current price $ 236.00
Foster 2903, 3 Series, Industrial Coupler, Manual, 1/8" Male NPT, Brass, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 2903 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series — t...
View full detailsOriginal price $ 293.00Original price $ 293.00 - Original price $ 293.00Original price $ 293.00Current price $ 236.00$ 236.00 - $ 236.00Current price $ 236.00Save 19% -
Original price $ 1,205.00Original price $ 1,205.00 - Original price $ 1,205.00Original price $ 1,205.00Current price $ 964.00$ 964.00 - $ 964.00Current price $ 964.00
Foster 3603S/S, 3 Series, Industrial Coupler, Manual, 1/4" Hose Barb, Stainless Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3603S/S is a 303 Stainless 1/4" industrial coupler from the Foster 3 Serie...
View full detailsOriginal price $ 1,205.00Original price $ 1,205.00 - Original price $ 1,205.00Original price $ 1,205.00Current price $ 964.00$ 964.00 - $ 964.00Current price $ 964.00Save 20% -
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 FM1513, 3 Series, Industrial Coupler, Automatic, 1/4" Push-On Hose Barb, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster FM1513 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 $ 399.00Original price $ 399.00 - Original price $ 399.00Original price $ 399.00Current price $ 318.00$ 318.00 - $ 318.00Current price $ 318.00
Foster 3303GS, 3 Series, Industrial Coupler, Automatic, 3/8" Male NPT, Brass, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3303GS is a Steel 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price $ 399.00Original price $ 399.00 - Original price $ 399.00Original price $ 399.00Current price $ 318.00$ 318.00 - $ 318.00Current price $ 318.00Save 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 2803GB, 3 Series, Industrial Coupler, Automatic, 1/8" Female NPT, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 2803GB 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 $ 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 $ 515.00Original price $ 515.00 - Original price $ 515.00Original price $ 515.00Current price $ 413.00$ 413.00 - $ 413.00Current price $ 413.00
Foster 3603GB, 3 Series, Industrial Coupler, Automatic, 1/4" Hose Barb, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3603GB is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price $ 515.00Original price $ 515.00 - Original price $ 515.00Original price $ 515.00Current price $ 413.00$ 413.00 - $ 413.00Current price $ 413.00Save 20% -
Original price $ 417.00Original price $ 417.00 - Original price $ 417.00Original price $ 417.00Current price $ 335.00$ 335.00 - $ 335.00Current price $ 335.00
Foster FM2803, 3 Series, Industrial Coupler, Automatic, 1/8" Female NPT, 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 $ 417.00Original price $ 417.00 - Original price $ 417.00Original price $ 417.00Current price $ 335.00$ 335.00 - $ 335.00Current price $ 335.00Save 20% -
Original price $ 386.00Original price $ 386.00 - Original price $ 386.00Original price $ 386.00Current price $ 310.00$ 310.00 - $ 310.00Current price $ 310.00
Foster FM2903, 3 Series, Industrial Coupler, Automatic, 1/8" Male NPT, 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 $ 386.00Original price $ 386.00 - Original price $ 386.00Original price $ 386.00Current price $ 310.00$ 310.00 - $ 310.00Current price $ 310.00Save 20% -
Original price $ 267.00Original price $ 267.00 - Original price $ 267.00Original price $ 267.00Current price $ 213.00$ 213.00 - $ 213.00Current price $ 213.00
Foster SG1513, 3 Series, Industrial Coupler, Manual, Sleeve Guard, 1/4" Push-On Hose Barb, 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 $ 267.00Original price $ 267.00 - Original price $ 267.00Original price $ 267.00Current price $ 213.00$ 213.00 - $ 213.00Current price $ 213.00Save 20% -
Original price $ 385.00Original price $ 385.00 - Original price $ 385.00Original price $ 385.00Current price $ 308.00$ 308.00 - $ 308.00Current price $ 308.00
Foster SG2803, 3 Series, Industrial Coupler, Manual, Sleeve Guard, 1/8" Female NPT, 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 $ 385.00Original price $ 385.00 - Original price $ 385.00Original price $ 385.00Current price $ 308.00$ 308.00 - $ 308.00Current price $ 308.00Save 20% -
Original price $ 317.00Original price $ 317.00 - Original price $ 317.00Original price $ 317.00Current price $ 252.00$ 252.00 - $ 252.00Current price $ 252.00
Foster SG2903, 3 Series, Industrial Coupler, Manual, Sleeve Guard, 1/8" Male NPT, 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 $ 317.00Original price $ 317.00 - Original price $ 317.00Original price $ 317.00Current price $ 252.00$ 252.00 - $ 252.00Current price $ 252.00Save 21% -
Original price $ 286.00Original price $ 286.00 - Original price $ 286.00Original price $ 286.00Current price $ 229.00$ 229.00 - $ 229.00Current price $ 229.00
Foster 1513, 3 Series, Industrial Coupler, Manual, 1/4" Hose Barb (Push-On), Brass, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 1513 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series — t...
View full detailsOriginal price $ 286.00Original price $ 286.00 - Original price $ 286.00Original price $ 286.00Current price $ 229.00$ 229.00 - $ 229.00Current price $ 229.00Save 20% -
Original price $ 306.00Original price $ 306.00 - Original price $ 306.00Original price $ 306.00Current price $ 245.00$ 245.00 - $ 245.00Current price $ 245.00
Foster 3653, 3 Series, Industrial Coupler, Manual, 5/16" Hose Barb, Brass, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3653 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series — t...
View full detailsOriginal price $ 306.00Original price $ 306.00 - Original price $ 306.00Original price $ 306.00Current price $ 245.00$ 245.00 - $ 245.00Current price $ 245.00Save 20% -
Original price $ 805.00Original price $ 805.00 - Original price $ 805.00Original price $ 805.00Current price $ 644.00$ 644.00 - $ 644.00Current price $ 644.00
Foster 3103S/S, 3 Series, Industrial Coupler, Manual, 1/4" Male NPT, Stainless Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3103S/S is a 303 Stainless 1/4" industrial coupler from the Foster 3 Serie...
View full detailsOriginal price $ 805.00Original price $ 805.00 - Original price $ 805.00Original price $ 805.00Current price $ 644.00$ 644.00 - $ 644.00Current price $ 644.00Save 20% -
Original price $ 797.00Original price $ 797.00 - Original price $ 797.00Original price $ 797.00Current price $ 638.00$ 638.00 - $ 638.00Current price $ 638.00
Foster 17-3S/S, 3 Series, Industrial Plug, 3/8" Hose Barb, Stainless Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 17-3S/S is a 303 Stainless 1/4" industrial plug from the Foster 3 Series —...
View full detailsOriginal price $ 797.00Original price $ 797.00 - Original price $ 797.00Original price $ 797.00Current price $ 638.00$ 638.00 - $ 638.00Current price $ 638.00Save 20% -
Original price $ 175.00Original price $ 175.00 - Original price $ 175.00Original price $ 175.00Current price $ 140.00$ 140.00 - $ 140.00Current price $ 140.00
Foster 12S-3, 3 Series, Industrial Swivel Plug, 1/8" Male NPT, Steel, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 12S-3 is a Brass/Steel 1/4" industrial plug from the Foster 3 Series — the...
View full detailsOriginal price $ 175.00Original price $ 175.00 - Original price $ 175.00Original price $ 175.00Current price $ 140.00$ 140.00 - $ 140.00Current price $ 140.00Save 20% -
Original price $ 492.00Original price $ 492.00 - Original price $ 492.00Original price $ 492.00Current price $ 394.00$ 394.00 - $ 394.00Current price $ 394.00
Foster 14S-3, 3 Series, Industrial Swivel Plug, 3/8" Male NPT, Steel, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 14S-3 is a Brass/Steel 1/4" industrial plug from the Foster 3 Series — the...
View full detailsOriginal price $ 492.00Original price $ 492.00 - Original price $ 492.00Original price $ 492.00Current price $ 394.00$ 394.00 - $ 394.00Current price $ 394.00Save 20% -
Original price $ 1,187.00Original price $ 1,187.00 - Original price $ 1,187.00Original price $ 1,187.00Current price $ 949.00$ 949.00 - $ 949.00Current price $ 949.00
Foster 3203S/S, 3 Series, Industrial Coupler, Manual, 3/8" Female NPT, Stainless Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3203S/S is a 303 Stainless 1/4" industrial coupler from the Foster 3 Serie...
View full detailsOriginal price $ 1,187.00Original price $ 1,187.00 - Original price $ 1,187.00Original price $ 1,187.00Current price $ 949.00$ 949.00 - $ 949.00Current price $ 949.00Save 20% -
Original price $ 1,230.00Original price $ 1,230.00 - Original price $ 1,230.00Original price $ 1,230.00Current price $ 985.00$ 985.00 - $ 985.00Current price $ 985.00
Foster 3703S/S, 3 Series, Industrial Coupler, Manual, 3/8" Hose Barb, Stainless Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3703S/S is a 303 Stainless 1/4" industrial coupler from the Foster 3 Serie...
View full detailsOriginal price $ 1,230.00Original price $ 1,230.00 - Original price $ 1,230.00Original price $ 1,230.00Current price $ 985.00$ 985.00 - $ 985.00Current price $ 985.00Save 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 FM3653, 3 Series, Industrial Coupler, Automatic, 5/16" Hose Barb, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster FM3653 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...
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%
