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 €33,95 - Original price €33,95Original price€33,95€33,95 - €33,95Current price €33,95Foster 3003S/SH, 1/4" Industrial Coupler x 1/4" Female NPT, 3 Series, Heat/Viton, 303 Stainless
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3003S/SH is a 303 Stainless 1/4" industrial coupler from the Foster 3 Seri...
View full detailsOriginal price €33,95 - Original price €33,95Original price€33,95€33,95 - €33,95Current price €33,95 -
Original price €35,95 - Original price €35,95Original price€35,95€35,95 - €35,95Current price €35,95
Foster BL3003S/S, 1/4" Industrial Coupler x 1/4" Female NPT, 3 Series, Ball Lock, 303 Stainless
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster BL3003S/S is a 303 Stainless 1/4" industrial coupler from the Foster 3 Ser...
View full detailsOriginal price €35,95 - Original price €35,95Original price€35,95€35,95 - €35,95Current price €35,95 -
Original price €31,95 - Original price €31,95Original price€31,95€31,95 - €31,95Current price €31,95
Foster 3003S/S, 1/4" Industrial Coupler x 1/4" Female NPT, 3 Series, 303 Stainless
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3003S/S is a 303 Stainless 1/4" industrial coupler from the Foster 3 Serie...
View full detailsOriginal price €31,95 - Original price €31,95Original price€31,95€31,95 - €31,95Current price €31,95 -
Original price €13,95 - Original price €13,95Original price€13,95€13,95 - €13,95Current price €13,95
Foster 3003S, 1/4" Industrial Coupler x 1/4" Female NPT, 3 Series, Steam/EPDM, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3003S is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — the...
View full detailsOriginal price €13,95 - Original price €13,95Original price€13,95€13,95 - €13,95Current price €13,95 -
Original price €10,95 - Original price €10,95Original price€10,95€10,95 - €10,95Current price €10,95
Foster 3003LV, 1/4" Industrial Coupler x 1/4" Female NPT, 3 Series, Less Valve, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3003LV is a Steel 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price €10,95 - Original price €10,95Original price€10,95€10,95 - €10,95Current price €10,95 -
Original price €14,95 - Original price €14,95Original price€14,95€14,95 - €14,95Current price €14,95
Foster 3003HW, 1/4" Industrial Coupler x 1/4" Female NPT, 3 Series, Hot Water/Viton, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3003HW is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — th...
View full detailsOriginal price €14,95 - Original price €14,95Original price€14,95€14,95 - €14,95Current price €14,95 -
Original price €11,95 - Original price €11,95Original price€11,95€11,95 - €11,95Current price €11,95
Foster 3003H, 1/4" Industrial Coupler x 1/4" Female NPT, 3 Series, Heat/Viton, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3003H is a Steel 1/4" industrial coupler from the Foster 3 Series — the mo...
View full detailsOriginal price €11,95 - Original price €11,95Original price€11,95€11,95 - €11,95Current price €11,95 -
Original price €11,95 - Original price €11,95Original price€11,95€11,95 - €11,95Current price €11,95
Foster 3003D, 1/4" Industrial Coupler x 1/4" Female NPT, 3 Series, Dill Valve, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3003D is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series — ...
View full detailsOriginal price €11,95 - Original price €11,95Original price€11,95€11,95 - €11,95Current price €11,95 -
Original price €12,95 - Original price €12,95Original price€12,95€12,95 - €12,95Current price €12,95
Foster BL3003, 1/4" Industrial Coupler x 1/4" Female NPT, 3 Series, Ball Lock, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster BL3003 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 -
Original price €10,95 - Original price €10,95Original price€10,95€10,95 - €10,95Current price €10,95
Foster 3003, 1/4" Industrial Coupler x 1/4" Female NPT, 3 Series, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3003 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series — t...
View full detailsOriginal price €10,95 - Original price €10,95Original price€10,95€10,95 - €10,95Current price €10,95 -
Original price €16,95 - Original price €16,95Original price€16,95€16,95 - €16,95Current price €16,95
Foster 2803W, 1/4" Industrial Coupler x 1/8" Female NPT, 3 Series, Water, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 2803W is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — the...
View full detailsOriginal price €16,95 - Original price €16,95Original price€16,95€16,95 - €16,95Current price €16,95 -
Original price €42,95 - Original price €42,95Original price€42,95€42,95 - €42,95Current price €42,95
Foster 2803S/S, 1/4" Industrial Coupler x 1/8" Female NPT, 3 Series, 303 Stainless
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 2803S/S is a 303 Stainless 1/4" industrial coupler from the Foster 3 Serie...
View full detailsOriginal price €42,95 - Original price €42,95Original price€42,95€42,95 - €42,95Current price €42,95 -
Original price €16,95 - Original price €16,95Original price€16,95€16,95 - €16,95Current price €16,95
Foster 2803S, 1/4" Industrial Coupler x 1/8" Female NPT, 3 Series, Steam/EPDM, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 2803S is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — the...
View full detailsOriginal price €16,95 - Original price €16,95Original price€16,95€16,95 - €16,95Current price €16,95 -
Original price €15,95 - Original price €15,95Original price€15,95€15,95 - €15,95Current price €15,95
Foster 2803H, 1/4" Industrial Coupler x 1/8" Female NPT, 3 Series, Heat/Viton, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 2803H is a Steel 1/4" industrial coupler from the Foster 3 Series — the mo...
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 BL2803, 1/4" Industrial Coupler x 1/8" Female NPT, 3 Series, Ball Lock, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster BL2803 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 €13,95 - Original price €13,95Original price€13,95€13,95 - €13,95Current price €13,95
Foster 2803, 1/4" Industrial Coupler x 1/8" Female NPT, 3 Series, 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 €13,95 - Original price €13,95Original price€13,95€13,95 - €13,95Current price €13,95
