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 €15,95 - Original price €15,95Original price€15,95€15,95 - €15,95Current price €15,95Foster BLSD7-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 3/8" ID x 5/8" OD, 3 Series, Ball Lock, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster BLSD7-3 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series ...
View full detailsOriginal price €15,95 - Original price €15,95Original price€15,95€15,95 - €15,95Current price €15,95 -
Original price €14,95 - Original price €14,95Original price€14,95€14,95 - €14,95Current price €14,95
Foster SD7-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 3/8" ID x 5/8" OD, 3 Series, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SD7-3 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series — ...
View full detailsOriginal price €14,95 - Original price €14,95Original price€14,95€14,95 - €14,95Current price €14,95 -
Original price €23,95 - Original price €23,95Original price€23,95€23,95 - €23,95Current price €23,95
Foster BLSC7-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 5/16" ID x 5/8" OD, 3 Series, Ball Lock, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster BLSC7-3 is a Brass/Steel 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 €23,95 - Original price €23,95Original price€23,95€23,95 - €23,95Current price €23,95
Foster SC7-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 5/16" ID x 5/8" OD, 3 Series, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SC7-3 is a Brass/Steel 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 €23,95 - Original price €23,95Original price€23,95€23,95 - €23,95Current price €23,95
Foster BLSC5-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 5/16" ID x 9/16" OD, 3 Series, Ball Lock, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster BLSC5-3 is a Brass/Steel 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 €23,95 - Original price €23,95Original price€23,95€23,95 - €23,95Current price €23,95
Foster SC5-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 5/16" ID x 9/16" OD, 3 Series, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SC5-3 is a Brass/Steel 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 €19,95 - Original price €19,95Original price€19,95€19,95 - €19,95Current price €19,95
Foster BLSB7-3W, 1/4" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 5/8" OD, 3 Series, Ball Lock, Water, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster BLSB7-3W is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — ...
View full detailsOriginal price €19,95 - Original price €19,95Original price€19,95€19,95 - €19,95Current price €19,95 -
Original price €16,95 - Original price €16,95Original price€16,95€16,95 - €16,95Current price €16,95
Foster SB7-3W, 1/4" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 5/8" OD, 3 Series, Water, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SB7-3W is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — th...
View full detailsOriginal price €16,95 - Original price €16,95Original price€16,95€16,95 - €16,95Current price €16,95 -
Original price €48,95 - Original price €48,95Original price€48,95€48,95 - €48,95Current price €48,95
Foster BLSB7-3S/S, 1/4" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 5/8" OD, 3 Series, Ball Lock, 303 Stainless
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster BLSB7-3S/S is a 303 Stainless 1/4" industrial coupler from the Foster 3 Se...
View full detailsOriginal price €48,95 - Original price €48,95Original price€48,95€48,95 - €48,95Current price €48,95 -
Original price €45,95 - Original price €45,95Original price€45,95€45,95 - €45,95Current price €45,95
Foster SB7-3S/S, 1/4" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 5/8" OD, 3 Series, 303 Stainless
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SB7-3S/S is a 303 Stainless 1/4" industrial coupler from the Foster 3 Seri...
View full detailsOriginal price €45,95 - Original price €45,95Original price€45,95€45,95 - €45,95Current price €45,95 -
Original price €15,95 - Original price €15,95Original price€15,95€15,95 - €15,95Current price €15,95
Foster BLSB7-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 5/8" OD, 3 Series, Ball Lock, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster BLSB7-3 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series ...
View full detailsOriginal price €15,95 - Original price €15,95Original price€15,95€15,95 - €15,95Current price €15,95 -
Original price €13,95 - Original price €13,95Original price€13,95€13,95 - €13,95Current price €13,95
Foster SB7-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 5/8" OD, 3 Series, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SB7-3 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series — ...
View full detailsOriginal price €13,95 - Original price €13,95Original price€13,95€13,95 - €13,95Current price €13,95 -
Original price €20,95 - Original price €20,95Original price€20,95€20,95 - €20,95Current price €20,95
Foster BLSB5-3W, 1/4" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 9/16" OD, 3 Series, Ball Lock, Water, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster BLSB5-3W is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — ...
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 BLSB5-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 9/16" OD, 3 Series, Ball Lock, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster BLSB5-3 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series ...
View full detailsOriginal price €15,95 - Original price €15,95Original price€15,95€15,95 - €15,95Current price €15,95 -
Original price €15,95 - Original price €15,95Original price€15,95€15,95 - €15,95Current price €15,95
Foster SB5-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 9/16" OD, 3 Series, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SB5-3 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series — ...
View full detailsOriginal price €15,95 - Original price €15,95Original price€15,95€15,95 - €15,95Current price €15,95 -
Original price €17,95 - Original price €17,95Original price€17,95€17,95 - €17,95Current price €17,95
Foster SB3-3W, 1/4" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 1/2" OD, 3 Series, Water, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SB3-3W is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — th...
View full detailsOriginal price €17,95 - Original price €17,95Original price€17,95€17,95 - €17,95Current price €17,95 -
Original price €78,95 - Original price €78,95Original price€78,95€78,95 - €78,95Current price €78,95
Foster SB3-3S/S, 1/4" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 1/2" OD, 3 Series, 303 Stainless
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SB3-3S/S is a 303 Stainless 1/4" industrial coupler from the Foster 3 Seri...
View full detailsOriginal price €78,95 - Original price €78,95Original price€78,95€78,95 - €78,95Current price €78,95 -
Original price €18,95 - Original price €18,95Original price€18,95€18,95 - €18,95Current price €18,95
Foster BLSB3-3W, 1/4" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 1/2" OD, 3 Series, Ball Lock, Water, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster BLSB3-3W is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — ...
View full detailsOriginal price €18,95 - Original price €18,95Original price€18,95€18,95 - €18,95Current price €18,95 -
Original price €14,95 - Original price €14,95Original price€14,95€14,95 - €14,95Current price €14,95
Foster SB3-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 1/2" OD, 3 Series, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SB3-3 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series — ...
View full detailsOriginal price €14,95 - Original price €14,95Original price€14,95€14,95 - €14,95Current price €14,95 -
Original price €14,95 - Original price €14,95Original price€14,95€14,95 - €14,95Current price €14,95
Foster 3703W, 1/4" Industrial Coupler x 3/8" Hose ID, 3 Series, Water, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3703W is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — the...
View full detailsOriginal price €14,95 - Original price €14,95Original price€14,95€14,95 - €14,95Current price €14,95 -
Original price €51,95 - Original price €51,95Original price€51,95€51,95 - €51,95Current price €51,95
Foster BL3703S/S, 1/4" Industrial Coupler x 3/8" Hose ID, 3 Series, Ball Lock, 303 Stainless
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster BL3703S/S is a 303 Stainless 1/4" industrial coupler from the Foster 3 Ser...
View full detailsOriginal price €51,95 - Original price €51,95Original price€51,95€51,95 - €51,95Current price €51,95 -
Original price €49,95 - Original price €49,95Original price€49,95€49,95 - €49,95Current price €49,95
Foster 3703S/S, 1/4" Industrial Coupler x 3/8" Hose ID, 3 Series, 303 Stainless
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 €49,95 - Original price €49,95Original price€49,95€49,95 - €49,95Current price €49,95 -
Original price €14,95 - Original price €14,95Original price€14,95€14,95 - €14,95Current price €14,95
Foster 3703S, 1/4" Industrial Coupler x 3/8" Hose ID, 3 Series, Steam/EPDM, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3703S is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — the...
View full detailsOriginal price €14,95 - Original price €14,95Original price€14,95€14,95 - €14,95Current price €14,95 -
Original price €12,95 - Original price €12,95Original price€12,95€12,95 - €12,95Current price €12,95
Foster BL3703, 1/4" Industrial Coupler x 3/8" Hose ID, 3 Series, Ball Lock, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster BL3703 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series —...
View full detailsOriginal price €12,95 - Original price €12,95Original price€12,95€12,95 - €12,95Current price €12,95
