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 $ 30.89Original price $ 30.89 - Original price $ 30.89Original price $ 30.89Current price $ 24.69$ 24.69 - $ 24.69Current price $ 24.69
Foster SLSB5-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 1/4" 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 SLSB5-3 is a Brass 1/4" industrial coupler from the Foster 3 Series — the ...
View full detailsOriginal price $ 30.89Original price $ 30.89 - Original price $ 30.89Original price $ 30.89Current price $ 24.69$ 24.69 - $ 24.69Current price $ 24.69Save 20% -
Original price $ 30.29Original price $ 30.29 - Original price $ 30.29Original price $ 30.29Current price $ 24.19$ 24.19 - $ 24.19Current price $ 24.19
Foster SLSB3-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 1/2" OD, 3 Series, Automatic Sleeve Lock, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SLSB3-3 is a Brass 1/4" industrial coupler from the Foster 3 Series — the ...
View full detailsOriginal price $ 30.29Original price $ 30.29 - Original price $ 30.29Original price $ 30.29Current price $ 24.19$ 24.19 - $ 24.19Current price $ 24.19Save 20% -
Original price $ 30.89Original price $ 30.89 - Original price $ 30.89Original price $ 30.89Current price $ 24.69$ 24.69 - $ 24.69Current price $ 24.69
Foster FMSD13-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 3/8" ID x 13/16" OD, 3 Series, Automatic, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster FMSD13-3 is a Brass 1/4" industrial coupler from the Foster 3 Series — the...
View full detailsOriginal price $ 30.89Original price $ 30.89 - Original price $ 30.89Original price $ 30.89Current price $ 24.69$ 24.69 - $ 24.69Current price $ 24.69Save 20% -
Original price $ 29.09Original price $ 29.09 - Original price $ 29.09Original price $ 29.09Current price $ 23.29$ 23.29 - $ 23.29Current price $ 23.29
Foster FMSD11-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 3/8" ID x 3/4" OD, 3 Series, Automatic, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster FMSD11-3 is a Brass 1/4" industrial coupler from the Foster 3 Series — the...
View full detailsOriginal price $ 29.09Original price $ 29.09 - Original price $ 29.09Original price $ 29.09Current price $ 23.29$ 23.29 - $ 23.29Current price $ 23.29Save 20% -
Original price $ 28.49Original price $ 28.49 - Original price $ 28.49Original price $ 28.49Current price $ 22.79$ 22.79 - $ 22.79Current price $ 22.79
Foster FMSD9-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 3/8" ID x 11/16" OD, 3 Series, Automatic, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster FMSD9-3 is a Brass 1/4" industrial coupler from the Foster 3 Series — the ...
View full detailsOriginal price $ 28.49Original price $ 28.49 - Original price $ 28.49Original price $ 28.49Current price $ 22.79$ 22.79 - $ 22.79Current price $ 22.79Save 20% -
Original price $ 28.09Original price $ 28.09 - Original price $ 28.09Original price $ 28.09Current price $ 22.49$ 22.49 - $ 22.49Current price $ 22.49
Foster FMSD7-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 3/8" ID x 5/8" OD, 3 Series, Automatic, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster FMSD7-3 is a Brass 1/4" industrial coupler from the Foster 3 Series — the ...
View full detailsOriginal price $ 28.09Original price $ 28.09 - Original price $ 28.09Original price $ 28.09Current price $ 22.49$ 22.49 - $ 22.49Current price $ 22.49Save 20% -
Original price $ 40.19Original price $ 40.19 - Original price $ 40.19Original price $ 40.19Current price $ 32.19$ 32.19 - $ 32.19Current price $ 32.19
Foster FMSC7-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 5/16" ID x 5/8" OD, 3 Series, Automatic, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster FMSC7-3 is a Brass 1/4" industrial coupler from the Foster 3 Series — the ...
View full detailsOriginal price $ 40.19Original price $ 40.19 - Original price $ 40.19Original price $ 40.19Current price $ 32.19$ 32.19 - $ 32.19Current price $ 32.19Save 20% -
Original price $ 40.19Original price $ 40.19 - Original price $ 40.19Original price $ 40.19Current price $ 32.19$ 32.19 - $ 32.19Current price $ 32.19
Foster FMSC5-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 5/16" ID x 9/16" OD, 3 Series, Automatic, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster FMSC5-3 is a Brass 1/4" industrial coupler from the Foster 3 Series — the ...
View full detailsOriginal price $ 40.19Original price $ 40.19 - Original price $ 40.19Original price $ 40.19Current price $ 32.19$ 32.19 - $ 32.19Current price $ 32.19Save 20% -
Original price $ 26.29Original price $ 26.29 - Original price $ 26.29Original price $ 26.29Current price $ 20.99$ 20.99 - $ 20.99Current price $ 20.99
Foster FMSB7-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 5/8" OD, 3 Series, Automatic, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster FMSB7-3 is a Brass 1/4" industrial coupler from the Foster 3 Series — the ...
View full detailsOriginal price $ 26.29Original price $ 26.29 - Original price $ 26.29Original price $ 26.29Current price $ 20.99$ 20.99 - $ 20.99Current price $ 20.99Save 20% -
Original price $ 27.09Original price $ 27.09 - Original price $ 27.09Original price $ 27.09Current price $ 21.69$ 21.69 - $ 21.69Current price $ 21.69
Foster FMSB5-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 9/16" OD, 3 Series, Automatic, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster FMSB5-3 is a Brass 1/4" industrial coupler from the Foster 3 Series — the ...
View full detailsOriginal price $ 27.09Original price $ 27.09 - Original price $ 27.09Original price $ 27.09Current price $ 21.69$ 21.69 - $ 21.69Current price $ 21.69Save 20% -
Original price $ 26.69Original price $ 26.69 - Original price $ 26.69Original price $ 26.69Current price $ 21.39$ 21.39 - $ 21.39Current price $ 21.39
Foster FMSB3-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 1/2" OD, 3 Series, Automatic, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster FMSB3-3 is a Brass 1/4" industrial coupler from the Foster 3 Series — the ...
View full detailsOriginal price $ 26.69Original price $ 26.69 - Original price $ 26.69Original price $ 26.69Current price $ 21.39$ 21.39 - $ 21.39Current price $ 21.39Save 20% -
Original price $ 26.69Original price $ 26.69 - Original price $ 26.69Original price $ 26.69Current price $ 21.39$ 21.39 - $ 21.39Current price $ 21.39
Foster FM3703S, 1/4" Industrial Coupler x 3/8" Hose ID, 3 Series, Automatic, Steam/EPDM, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster FM3703S is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — t...
View full detailsOriginal price $ 26.69Original price $ 26.69 - Original price $ 26.69Original price $ 26.69Current price $ 21.39$ 21.39 - $ 21.39Current price $ 21.39Save 20% -
Original price $ 27.29Original price $ 27.29 - Original price $ 27.29Original price $ 27.29Current price $ 21.89$ 21.89 - $ 21.89Current price $ 21.89
Foster SL3703, 1/4" Industrial Coupler x 3/8" Hose ID, 3 Series, Automatic Sleeve Lock, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SL3703 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price $ 27.29Original price $ 27.29 - Original price $ 27.29Original price $ 27.29Current price $ 21.89$ 21.89 - $ 21.89Current price $ 21.89Save 20% -
Original price $ 23.59Original price $ 23.59 - Original price $ 23.59Original price $ 23.59Current price $ 18.89$ 18.89 - $ 18.89Current price $ 18.89
Foster FM3703, 1/4" Industrial Coupler x 3/8" Hose ID, 3 Series, Automatic, 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 $ 23.59Original price $ 23.59 - Original price $ 23.59Original price $ 23.59Current price $ 18.89$ 18.89 - $ 18.89Current price $ 18.89Save 20% -
Original price $ 27.99Original price $ 27.99 - Original price $ 27.99Original price $ 27.99Current price $ 22.39$ 22.39 - $ 22.39Current price $ 22.39
Foster SL3653, 1/4" Industrial Coupler x 5/16" Hose ID, 3 Series, Automatic Sleeve Lock, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SL3653 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price $ 27.99Original price $ 27.99 - Original price $ 27.99Original price $ 27.99Current price $ 22.39$ 22.39 - $ 22.39Current price $ 22.39Save 20% -
Original price $ 23.19Original price $ 23.19 - Original price $ 23.19Original price $ 23.19Current price $ 18.59$ 18.59 - $ 18.59Current price $ 18.59
Foster FM3653, 1/4" Industrial Coupler x 5/16" Hose ID, 3 Series, Automatic, 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 $ 23.19Original price $ 23.19 - Original price $ 23.19Original price $ 23.19Current price $ 18.59$ 18.59 - $ 18.59Current price $ 18.59Save 20% -
Original price $ 26.89Original price $ 26.89 - Original price $ 26.89Original price $ 26.89Current price $ 21.49$ 21.49 - $ 21.49Current price $ 21.49
Foster FM3603S, 1/4" Industrial Coupler x 1/4" Hose ID, 3 Series, Automatic, Steam/EPDM, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster FM3603S is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — t...
View full detailsOriginal price $ 26.89Original price $ 26.89 - Original price $ 26.89Original price $ 26.89Current price $ 21.49$ 21.49 - $ 21.49Current price $ 21.49Save 20% -
Original price $ 27.49Original price $ 27.49 - Original price $ 27.49Original price $ 27.49Current price $ 21.99$ 21.99 - $ 21.99Current price $ 21.99
Foster SL3603, 1/4" Industrial Coupler x 1/4" Hose ID, 3 Series, Automatic Sleeve Lock, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SL3603 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price $ 27.49Original price $ 27.49 - Original price $ 27.49Original price $ 27.49Current price $ 21.99$ 21.99 - $ 21.99Current price $ 21.99Save 20% -
Original price $ 22.79Original price $ 22.79 - Original price $ 22.79Original price $ 22.79Current price $ 18.29$ 18.29 - $ 18.29Current price $ 18.29
Foster FM3603, 1/4" Industrial Coupler x 1/4" Hose ID, 3 Series, Automatic, 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 $ 22.79Original price $ 22.79 - Original price $ 22.79Original price $ 22.79Current price $ 18.29$ 18.29 - $ 18.29Current price $ 18.29Save 20% -
Original price $ 25.09Original price $ 25.09 - Original price $ 25.09Original price $ 25.09Current price $ 20.09$ 20.09 - $ 20.09Current price $ 20.09
Foster FM1713W, 1/4" Industrial Coupler x 3/8" Push-On Hose Stem, 3 Series, Automatic, Water, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster FM1713W is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — t...
View full detailsOriginal price $ 25.09Original price $ 25.09 - Original price $ 25.09Original price $ 25.09Current price $ 20.09$ 20.09 - $ 20.09Current price $ 20.09Save 20% -
Original price $ 26.69Original price $ 26.69 - Original price $ 26.69Original price $ 26.69Current price $ 21.39$ 21.39 - $ 21.39Current price $ 21.39
Foster SL1713, 1/4" Industrial Coupler x 3/8" Push-On Hose Stem, 3 Series, Automatic Sleeve Lock, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SL1713 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price $ 26.69Original price $ 26.69 - Original price $ 26.69Original price $ 26.69Current price $ 21.39$ 21.39 - $ 21.39Current price $ 21.39Save 20% -
Original price $ 21.99Original price $ 21.99 - Original price $ 21.99Original price $ 21.99Current price $ 17.59$ 17.59 - $ 17.59Current price $ 17.59
Foster FM1713, 1/4" Industrial Coupler x 3/8" Push-On Hose Stem, 3 Series, Automatic, 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 $ 21.99Original price $ 21.99 - Original price $ 21.99Original price $ 21.99Current price $ 17.59$ 17.59 - $ 17.59Current price $ 17.59Save 20% -
Original price $ 26.09Original price $ 26.09 - Original price $ 26.09Original price $ 26.09Current price $ 20.79$ 20.79 - $ 20.79Current price $ 20.79
Foster SL1513, 1/4" Industrial Coupler x 1/4" Push-On Hose Stem, 3 Series, Automatic Sleeve Lock, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SL1513 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price $ 26.09Original price $ 26.09 - Original price $ 26.09Original price $ 26.09Current price $ 20.79$ 20.79 - $ 20.79Current price $ 20.79Save 20% -
Original price $ 21.39Original price $ 21.39 - Original price $ 21.39Original price $ 21.39Current price $ 17.09$ 17.09 - $ 17.09Current price $ 17.09
Foster FM1513, 1/4" Industrial Coupler x 1/4" Push-On Hose Stem, 3 Series, Automatic, 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 $ 21.39Original price $ 21.39 - Original price $ 21.39Original price $ 21.39Current price $ 17.09$ 17.09 - $ 17.09Current price $ 17.09Save 20%
