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 $ 554.00Original price $ 554.00 - Original price $ 554.00Original price $ 554.00Current price $ 443.00$ 443.00 - $ 443.00Current price $ 443.00
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 $ 554.00Original price $ 554.00 - Original price $ 554.00Original price $ 554.00Current price $ 443.00$ 443.00 - $ 443.00Current price $ 443.00Save 20% -
Original price $ 543.00Original price $ 543.00 - Original price $ 543.00Original price $ 543.00Current price $ 434.00$ 434.00 - $ 434.00Current price $ 434.00
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 $ 543.00Original price $ 543.00 - Original price $ 543.00Original price $ 543.00Current price $ 434.00$ 434.00 - $ 434.00Current price $ 434.00Save 20% -
Original price $ 554.00Original price $ 554.00 - Original price $ 554.00Original price $ 554.00Current price $ 443.00$ 443.00 - $ 443.00Current price $ 443.00
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 $ 554.00Original price $ 554.00 - Original price $ 554.00Original price $ 554.00Current price $ 443.00$ 443.00 - $ 443.00Current price $ 443.00Save 20% -
Original price $ 521.00Original price $ 521.00 - Original price $ 521.00Original price $ 521.00Current price $ 417.00$ 417.00 - $ 417.00Current price $ 417.00
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 $ 521.00Original price $ 521.00 - Original price $ 521.00Original price $ 521.00Current price $ 417.00$ 417.00 - $ 417.00Current price $ 417.00Save 20% -
Original price $ 511.00Original price $ 511.00 - Original price $ 511.00Original price $ 511.00Current price $ 409.00$ 409.00 - $ 409.00Current price $ 409.00
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 $ 511.00Original price $ 511.00 - Original price $ 511.00Original price $ 511.00Current price $ 409.00$ 409.00 - $ 409.00Current price $ 409.00Save 20% -
Original price $ 503.00Original price $ 503.00 - Original price $ 503.00Original price $ 503.00Current price $ 403.00$ 403.00 - $ 403.00Current price $ 403.00
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 $ 503.00Original price $ 503.00 - Original price $ 503.00Original price $ 503.00Current price $ 403.00$ 403.00 - $ 403.00Current price $ 403.00Save 20% -
Original price $ 720.00Original price $ 720.00 - Original price $ 720.00Original price $ 720.00Current price $ 577.00$ 577.00 - $ 577.00Current price $ 577.00
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 $ 720.00Original price $ 720.00 - Original price $ 720.00Original price $ 720.00Current price $ 577.00$ 577.00 - $ 577.00Current price $ 577.00Save 20% -
Original price $ 720.00Original price $ 720.00 - Original price $ 720.00Original price $ 720.00Current price $ 577.00$ 577.00 - $ 577.00Current price $ 577.00
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 $ 720.00Original price $ 720.00 - Original price $ 720.00Original price $ 720.00Current price $ 577.00$ 577.00 - $ 577.00Current price $ 577.00Save 20% -
Original price $ 471.00Original price $ 471.00 - Original price $ 471.00Original price $ 471.00Current price $ 376.00$ 376.00 - $ 376.00Current price $ 376.00
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 $ 471.00Original price $ 471.00 - Original price $ 471.00Original price $ 471.00Current price $ 376.00$ 376.00 - $ 376.00Current price $ 376.00Save 20% -
Original price $ 486.00Original price $ 486.00 - Original price $ 486.00Original price $ 486.00Current price $ 389.00$ 389.00 - $ 389.00Current price $ 389.00
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 $ 486.00Original price $ 486.00 - Original price $ 486.00Original price $ 486.00Current price $ 389.00$ 389.00 - $ 389.00Current price $ 389.00Save 20% -
Original price $ 478.00Original price $ 478.00 - Original price $ 478.00Original price $ 478.00Current price $ 383.00$ 383.00 - $ 383.00Current price $ 383.00
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 $ 478.00Original price $ 478.00 - Original price $ 478.00Original price $ 478.00Current price $ 383.00$ 383.00 - $ 383.00Current price $ 383.00Save 20% -
Original price $ 478.00Original price $ 478.00 - Original price $ 478.00Original price $ 478.00Current price $ 383.00$ 383.00 - $ 383.00Current price $ 383.00
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 $ 478.00Original price $ 478.00 - Original price $ 478.00Original price $ 478.00Current price $ 383.00$ 383.00 - $ 383.00Current price $ 383.00Save 20% -
Original price $ 489.00Original price $ 489.00 - Original price $ 489.00Original price $ 489.00Current price $ 392.00$ 392.00 - $ 392.00Current price $ 392.00
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 $ 489.00Original price $ 489.00 - Original price $ 489.00Original price $ 489.00Current price $ 392.00$ 392.00 - $ 392.00Current price $ 392.00Save 20% -
Original price $ 423.00Original price $ 423.00 - Original price $ 423.00Original price $ 423.00Current price $ 339.00$ 339.00 - $ 339.00Current price $ 339.00
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 $ 423.00Original price $ 423.00 - Original price $ 423.00Original price $ 423.00Current price $ 339.00$ 339.00 - $ 339.00Current price $ 339.00Save 20% -
Original price $ 502.00Original price $ 502.00 - Original price $ 502.00Original price $ 502.00Current price $ 401.00$ 401.00 - $ 401.00Current price $ 401.00
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 $ 502.00Original price $ 502.00 - Original price $ 502.00Original price $ 502.00Current price $ 401.00$ 401.00 - $ 401.00Current price $ 401.00Save 20% -
Original price $ 416.00Original price $ 416.00 - Original price $ 416.00Original price $ 416.00Current price $ 333.00$ 333.00 - $ 333.00Current price $ 333.00
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 $ 416.00Original price $ 416.00 - Original price $ 416.00Original price $ 416.00Current price $ 333.00$ 333.00 - $ 333.00Current price $ 333.00Save 20% -
Original price $ 482.00Original price $ 482.00 - Original price $ 482.00Original price $ 482.00Current price $ 385.00$ 385.00 - $ 385.00Current price $ 385.00
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 $ 482.00Original price $ 482.00 - Original price $ 482.00Original price $ 482.00Current price $ 385.00$ 385.00 - $ 385.00Current price $ 385.00Save 20% -
Original price $ 493.00Original price $ 493.00 - Original price $ 493.00Original price $ 493.00Current price $ 394.00$ 394.00 - $ 394.00Current price $ 394.00
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 $ 493.00Original price $ 493.00 - Original price $ 493.00Original price $ 493.00Current price $ 394.00$ 394.00 - $ 394.00Current price $ 394.00Save 20% -
Original price $ 409.00Original price $ 409.00 - Original price $ 409.00Original price $ 409.00Current price $ 328.00$ 328.00 - $ 328.00Current price $ 328.00
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 $ 409.00Original price $ 409.00 - Original price $ 409.00Original price $ 409.00Current price $ 328.00$ 328.00 - $ 328.00Current price $ 328.00Save 20% -
Original price $ 450.00Original price $ 450.00 - Original price $ 450.00Original price $ 450.00Current price $ 360.00$ 360.00 - $ 360.00Current price $ 360.00
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 $ 450.00Original price $ 450.00 - Original price $ 450.00Original price $ 450.00Current price $ 360.00$ 360.00 - $ 360.00Current price $ 360.00Save 20% -
Original price $ 478.00Original price $ 478.00 - Original price $ 478.00Original price $ 478.00Current price $ 383.00$ 383.00 - $ 383.00Current price $ 383.00
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 $ 478.00Original price $ 478.00 - Original price $ 478.00Original price $ 478.00Current price $ 383.00$ 383.00 - $ 383.00Current price $ 383.00Save 20% -
Original price $ 394.00Original price $ 394.00 - Original price $ 394.00Original price $ 394.00Current price $ 315.00$ 315.00 - $ 315.00Current price $ 315.00
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 $ 394.00Original price $ 394.00 - Original price $ 394.00Original price $ 394.00Current price $ 315.00$ 315.00 - $ 315.00Current price $ 315.00Save 20% -
Original price $ 468.00Original price $ 468.00 - Original price $ 468.00Original price $ 468.00Current price $ 373.00$ 373.00 - $ 373.00Current price $ 373.00
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 $ 468.00Original price $ 468.00 - Original price $ 468.00Original price $ 468.00Current price $ 373.00$ 373.00 - $ 373.00Current price $ 373.00Save 20% -
Original price $ 383.00Original price $ 383.00 - Original price $ 383.00Original price $ 383.00Current price $ 306.00$ 306.00 - $ 306.00Current price $ 306.00
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 $ 383.00Original price $ 383.00 - Original price $ 383.00Original price $ 383.00Current price $ 306.00$ 306.00 - $ 306.00Current price $ 306.00Save 20%
