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 $ 131.00Original price $ 131.00 - Original price $ 131.00Original price $ 131.00Current price $ 104.00$ 104.00 - $ 104.00Current price $ 104.00
Foster PB3-3, 1/4" Industrial Plug x Reusable Hose Fitting, 1/4" ID x 1/2" OD, 3 Series, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster PB3-3 is a Steel 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 $ 104.00$ 104.00 - $ 104.00Current price $ 104.00Save 21% -
Original price $ 492.00Original price $ 492.00 - Original price $ 492.00Original price $ 492.00Current price $ 393.00$ 393.00 - $ 393.00Current price $ 393.00
Foster 14S-3, 1/4" Industrial Plug x 3/8" Male NPT, 3 Series, Free Swivel, Brass/Steel
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 $ 393.00$ 393.00 - $ 393.00Current price $ 393.00Save 20% -
Original price $ 156.00Original price $ 156.00 - Original price $ 156.00Original price $ 156.00Current price $ 124.00$ 124.00 - $ 124.00Current price $ 124.00
Foster 10S-3, 1/4" Industrial Plug x 1/4" Male NPT, 3 Series, Free Swivel, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 10S-3 is a Brass/Steel 1/4" industrial plug from the Foster 3 Series — the...
View full detailsOriginal price $ 156.00Original price $ 156.00 - Original price $ 156.00Original price $ 156.00Current price $ 124.00$ 124.00 - $ 124.00Current price $ 124.00Save 21% -
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, 1/4" Industrial Plug x 1/8" Male NPT, 3 Series, Free Swivel, Brass/Steel
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 $ 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, 1/4" Industrial Plug x 3/8" Push-On Hose Stem, 3 Series, 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 $ 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, 1/4" Industrial Plug x 1/4" Push-On Hose Stem, 3 Series, 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 $ 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, 1/4" Industrial Plug x 3/8" Hose ID, 3 Series, 303 Stainless
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 $ 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, 1/4" Industrial Plug x 3/8" Hose ID, 3 Series, 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 $ 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, 1/4" Industrial Plug x 3/8" Hose ID, 3 Series, 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 $ 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, 1/4" Industrial Plug x 5/16" Hose ID, 3 Series, 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 $ 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, 1/4" Industrial Plug x 1/4" Hose ID, 3 Series, 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 $ 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, 1/4" Industrial Plug x 1/4" Hose ID, 3 Series, 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 $ 208.00Original price $ 208.00 - Original price $ 208.00Original price $ 208.00Current price $ 166.00$ 166.00 - $ 166.00Current price $ 166.00
Foster 14-3GB, 1/4" Industrial Plug x 3/8" Male NPT, 3 Series, Ball Check, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 14-3GB is a Brass 1/4" industrial plug from the Foster 3 Series — the most...
View full detailsOriginal price $ 208.00Original price $ 208.00 - Original price $ 208.00Original price $ 208.00Current price $ 166.00$ 166.00 - $ 166.00Current price $ 166.00Save 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, 1/4" Industrial Plug x 3/8" Male NPT, 3 Series, 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% -
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, 1/4" Industrial Plug x 3/8" Male NPT, 3 Series, 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 $ 204.00Original price $ 204.00 - Original price $ 204.00Original price $ 204.00Current price $ 163.00$ 163.00 - $ 163.00Current price $ 163.00
Foster 10-3GS/S, 1/4" Industrial Plug x 1/4" Male NPT, 3 Series, Ball Check, 303 Stainless
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 10-3GS/S is a 303 Stainless 1/4" industrial plug from the Foster 3 Series ...
View full detailsOriginal price $ 204.00Original price $ 204.00 - Original price $ 204.00Original price $ 204.00Current price $ 163.00$ 163.00 - $ 163.00Current price $ 163.00Save 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 10-3GS, 1/4" Industrial Plug x 1/4" Male NPT, 3 Series, Ball Check, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 10-3GS 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 $ 124.00Original price $ 124.00 - Original price $ 124.00Original price $ 124.00Current price $ 100.00$ 100.00 - $ 100.00Current price $ 100.00
Foster 10-3GB, 1/4" Industrial Plug x 1/4" Male NPT, 3 Series, Ball Check, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 10-3GB is a Brass 1/4" industrial plug from the Foster 3 Series — the most...
View full detailsOriginal price $ 124.00Original price $ 124.00 - Original price $ 124.00Original price $ 124.00Current price $ 100.00$ 100.00 - $ 100.00Current price $ 100.00Save 19% -
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 10-3G, 1/4" Industrial Plug x 1/4" Male NPT, 3 Series, Ball Check, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 10-3G is a Steel 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 $ 309.00Original price $ 309.00 - Original price $ 309.00Original price $ 309.00Current price $ 249.00$ 249.00 - $ 249.00Current price $ 249.00
Foster 10-3DB, 1/4" Industrial Plug x 1/4" Male NPT, 3 Series, Dill Valve, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 10-3DB is a Brass 1/4" industrial plug from the Foster 3 Series — the most...
View full detailsOriginal price $ 309.00Original price $ 309.00 - Original price $ 309.00Original price $ 309.00Current price $ 249.00$ 249.00 - $ 249.00Current price $ 249.00Save 19% -
Original price $ 225.00Original price $ 225.00 - Original price $ 225.00Original price $ 225.00Current price $ 181.00$ 181.00 - $ 181.00Current price $ 181.00
Foster 10-3D, 1/4" Industrial Plug x 1/4" Male NPT, 3 Series, Dill Valve, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 10-3D is a Steel 1/4" industrial plug from the Foster 3 Series — the most ...
View full detailsOriginal price $ 225.00Original price $ 225.00 - Original price $ 225.00Original price $ 225.00Current price $ 181.00$ 181.00 - $ 181.00Current price $ 181.00Save 20% -
Original price $ 170.00Original price $ 170.00 - Original price $ 170.00Original price $ 170.00Current price $ 136.00$ 136.00 - $ 136.00Current price $ 136.00
Foster 10-3S/S, 1/4" Industrial Plug x 1/4" Male NPT, 3 Series, 303 Stainless
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 10-3S/S is a 303 Stainless 1/4" industrial plug from the Foster 3 Series —...
View full detailsOriginal price $ 170.00Original price $ 170.00 - Original price $ 170.00Original price $ 170.00Current price $ 136.00$ 136.00 - $ 136.00Current price $ 136.00Save 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, 1/4" Industrial Plug x 1/4" Male NPT, 3 Series, 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 $ 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, 1/4" Industrial Plug x 1/4" Male NPT, 3 Series, 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%
