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 €19,95 - Original price €19,95Original price€19,95€19,95 - €19,95Current price €19,95Foster 3653GS, 1/4" Industrial Coupler x 5/16" Hose ID, 3 Series, Automatic Slim Profile, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3653GS is a Steel 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price €19,95 - Original price €19,95Original price€19,95€19,95 - €19,95Current price €19,95 -
Original price €20,95 - Original price €20,95Original price€20,95€20,95 - €20,95Current price €20,95
Foster 3653GB, 1/4" Industrial Coupler x 5/16" Hose ID, 3 Series, Automatic Slim Profile, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3653GB is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price €20,95 - Original price €20,95Original price€20,95€20,95 - €20,95Current price €20,95 -
Original price €16,95 - Original price €16,95Original price€16,95€16,95 - €16,95Current price €16,95
Foster 3603GS, 1/4" Industrial Coupler x 1/4" Hose ID, 3 Series, Automatic Slim Profile, 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 €16,95 - Original price €16,95Original price€16,95€16,95 - €16,95Current price €16,95 -
Original price €20,95 - Original price €20,95Original price€20,95€20,95 - €20,95Current price €20,95
Foster 3603GB, 1/4" Industrial Coupler x 1/4" Hose ID, 3 Series, Automatic Slim Profile, 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 €20,95 - Original price €20,95Original price€20,95€20,95 - €20,95Current price €20,95 -
Original price €15,95 - Original price €15,95Original price€15,95€15,95 - €15,95Current price €15,95
Foster 3303GS, 1/4" Industrial Coupler x 3/8" Male NPT, 3 Series, Automatic Slim Profile, 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 €15,95 - Original price €15,95Original price€15,95€15,95 - €15,95Current price €15,95 -
Original price €20,95 - Original price €20,95Original price€20,95€20,95 - €20,95Current price €20,95
Foster 3303GB, 1/4" Industrial Coupler x 3/8" Male NPT, 3 Series, Automatic Slim Profile, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3303GB is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price €20,95 - Original price €20,95Original price€20,95€20,95 - €20,95Current price €20,95 -
Original price €15,95 - Original price €15,95Original price€15,95€15,95 - €15,95Current price €15,95
Foster 3103GS, 1/4" Industrial Coupler x 1/4" Male NPT, 3 Series, Automatic Slim Profile, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3103GS is a Steel 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price €15,95 - Original price €15,95Original price€15,95€15,95 - €15,95Current price €15,95 -
Original price €19,95 - Original price €19,95Original price€19,95€19,95 - €19,95Current price €19,95
Foster 3103GB, 1/4" Industrial Coupler x 1/4" Male NPT, 3 Series, Automatic Slim Profile, 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 €19,95 - Original price €19,95Original price€19,95€19,95 - €19,95Current price €19,95 -
Original price €18,95 - Original price €18,95Original price€18,95€18,95 - €18,95Current price €18,95
Foster 2903GS, 1/4" Industrial Coupler x 1/8" Male NPT, 3 Series, Automatic Slim Profile, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 2903GS is a Steel 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price €18,95 - Original price €18,95Original price€18,95€18,95 - €18,95Current price €18,95 -
Original price €26,95 - Original price €26,95Original price€26,95€26,95 - €26,95Current price €26,95
Foster 2903GB, 1/4" Industrial Coupler x 1/8" Male NPT, 3 Series, Automatic Slim Profile, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 2903GB is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price €26,95 - Original price €26,95Original price€26,95€26,95 - €26,95Current price €26,95 -
Original price €16,95 - Original price €16,95Original price€16,95€16,95 - €16,95Current price €16,95
Foster 3203GS, 1/4" Industrial Coupler x 3/8" Female NPT, 3 Series, Automatic Slim Profile, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3203GS is a Steel 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price €16,95 - Original price €16,95Original price€16,95€16,95 - €16,95Current price €16,95 -
Original price €20,95 - Original price €20,95Original price€20,95€20,95 - €20,95Current price €20,95
Foster 3203GB, 1/4" Industrial Coupler x 3/8" Female NPT, 3 Series, Automatic Slim Profile, 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 €20,95 - Original price €20,95Original price€20,95€20,95 - €20,95Current price €20,95 -
Original price €15,95 - Original price €15,95Original price€15,95€15,95 - €15,95Current price €15,95
Foster 3003GS, 1/4" Industrial Coupler x 1/4" Female NPT, 3 Series, Automatic Slim Profile, 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 €15,95 - Original price €15,95Original price€15,95€15,95 - €15,95Current price €15,95 -
Original price €16,95 - Original price €16,95Original price€16,95€16,95 - €16,95Current price €16,95
Foster 3003GB, 1/4" Industrial Coupler x 1/4" Female NPT, 3 Series, Automatic Slim Profile, 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 €16,95 - Original price €16,95Original price€16,95€16,95 - €16,95Current price €16,95 -
Original price €21,95 - Original price €21,95Original price€21,95€21,95 - €21,95Current price €21,95
Foster 2803GS, 1/4" Industrial Coupler x 1/8" Female NPT, 3 Series, Automatic Slim Profile, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 2803GS is a Steel 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price €21,95 - Original price €21,95Original price€21,95€21,95 - €21,95Current price €21,95 -
Original price €18,95 - Original price €18,95Original price€18,95€18,95 - €18,95Current price €18,95
Foster 2803GB, 1/4" Industrial Coupler x 1/8" Female NPT, 3 Series, Automatic Slim Profile, 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 €18,95 - Original price €18,95Original price€18,95€18,95 - €18,95Current price €18,95 -
Original price €24,95 - Original price €24,95Original price€24,95€24,95 - €24,95Current price €24,95
Foster SLSD13-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 3/8" ID x 13/16" OD, 3 Series, Automatic Sleeve Lock, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SLSD13-3 is a Brass 1/4" industrial coupler from the Foster 3 Series — the...
View full detailsOriginal price €24,95 - Original price €24,95Original price€24,95€24,95 - €24,95Current price €24,95 -
Original price €23,95 - Original price €23,95Original price€23,95€23,95 - €23,95Current price €23,95
Foster SLSD11-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 3/8" ID x 3/4" OD, 3 Series, Automatic Sleeve Lock, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SLSD11-3 is a Brass 1/4" industrial coupler from the Foster 3 Series — the...
View full detailsOriginal price €23,95 - Original price €23,95Original price€23,95€23,95 - €23,95Current price €23,95 -
Original price €23,95 - Original price €23,95Original price€23,95€23,95 - €23,95Current price €23,95
Foster SLSD9-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 3/8" ID x 11/16" OD, 3 Series, Automatic Sleeve Lock, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SLSD9-3 is a Brass 1/4" industrial coupler from the Foster 3 Series — the ...
View full detailsOriginal price €23,95 - Original price €23,95Original price€23,95€23,95 - €23,95Current price €23,95 -
Original price €22,95 - Original price €22,95Original price€22,95€22,95 - €22,95Current price €22,95
Foster SLSD7-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 3/8" ID x 5/8" OD, 3 Series, Automatic Sleeve Lock, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SLSD7-3 is a Brass 1/4" industrial coupler from the Foster 3 Series — the ...
View full detailsOriginal price €22,95 - Original price €22,95Original price€22,95€22,95 - €22,95Current price €22,95 -
Original price €31,95 - Original price €31,95Original price€31,95€31,95 - €31,95Current price €31,95
Foster SLSC7-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 5/16" ID x 5/8" OD, 3 Series, Automatic Sleeve Lock, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SLSC7-3 is a Brass 1/4" industrial coupler from the Foster 3 Series — the ...
View full detailsOriginal price €31,95 - Original price €31,95Original price€31,95€31,95 - €31,95Current price €31,95 -
Original price €31,95 - Original price €31,95Original price€31,95€31,95 - €31,95Current price €31,95
Foster SLSC5-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 5/16" ID x 9/16" OD, 3 Series, Automatic Sleeve Lock, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SLSC5-3 is a Brass 1/4" industrial coupler from the Foster 3 Series — the ...
View full detailsOriginal price €31,95 - Original price €31,95Original price€31,95€31,95 - €31,95Current price €31,95 -
Original price €23,95 - Original price €23,95Original price€23,95€23,95 - €23,95Current price €23,95
Foster SLSB7-3W, 1/4" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 5/8" OD, 3 Series, Automatic Sleeve Lock, Water, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SLSB7-3W is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — ...
View full detailsOriginal price €23,95 - Original price €23,95Original price€23,95€23,95 - €23,95Current price €23,95 -
Original price €21,95 - Original price €21,95Original price€21,95€21,95 - €21,95Current price €21,95
Foster SLSB7-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 5/8" OD, 3 Series, Automatic Sleeve Lock, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SLSB7-3 is a Brass 1/4" industrial coupler from the Foster 3 Series — the ...
View full detailsOriginal price €21,95 - Original price €21,95Original price€21,95€21,95 - €21,95Current price €21,95
