Skip to content
End of Winter Sale: Everything 20% Off - Automatically at Checkout
End of Winter Sale: Everything 20% Off - Automatically at Checkout

ZSI Foster - 3 Series, 1/4" Body Industrial Interchange Pneumatic Couplers and Plugs

ZSI Foster's "3 Series" pneumatic fittings are the perfect solution for your industrial and manufacturing needs, including construction and repair shops. Made of durable brass or steel, these fittings are designed to connect flexible tubing such as polyurethane and nylon in various sizes. The quick-connect design allows for easy attachment and detachment from your pneumatic system, while their 1/4" industrial interchange compatibility means they can be used with fittings from other manufacturers. With their reliability and versatility, the "3 Series" fittings are a top choice for a wide range of pneumatic applications in construction and repair shops. Trust ZSI Foster to deliver high-quality fittings that get the job done right.
  • Original price $ 11.89 - Original price $ 11.89
    Original price
    $ 11.89
    $ 11.89 - $ 11.89
    Current price $ 11.89

    Foster SG3203, 3 Series, Industrial Coupler, Manual, Sleeve Guard, 3/8" Female NPT, Brass

    In stock

    Series: 3 Part Number: SG3203 Interchange: Industrial, I/M Body: 1/4" Coupler, Manual, Sleeve Guard Thread: 3/8" Female NPT, FPT Material:...

    View full details
    Original price $ 11.89 - Original price $ 11.89
    Original price
    $ 11.89
    $ 11.89 - $ 11.89
    Current price $ 11.89
  • Original price $ 12.89 - Original price $ 12.89
    Original price
    $ 12.89
    $ 12.89 - $ 12.89
    Current price $ 12.89

    Foster SG1713, 3 Series, Industrial Coupler, Manual, Sleeve Guard, 3/8" Push-On Hose Barb, Brass

    In stock

    Series: 3 Part Number: SG1713 Interchange: Industrial, I/M Body: 1/4" Coupler, Manual, Sleeve Guard Thread: 3/8" Push-On Hose Barb Materia...

    View full details
    Original price $ 12.89 - Original price $ 12.89
    Original price
    $ 12.89
    $ 12.89 - $ 12.89
    Current price $ 12.89
  • Original price $ 6.89 - Original price $ 6.89
    Original price
    $ 6.89
    $ 6.89 - $ 6.89
    Current price $ 6.89

    Foster 16-3B, 3 Series, Industrial Plug, 1/4" Hose Barb, Brass

    In stock

    Series: 3 Part Number: 16-3B Interchange: Industrial Body: 1/4" Plug Thread: 1/4" Hose Barb Material: Heavy-Duty Brass Rated Pressure: 3...

    View full details
    Original price $ 6.89 - Original price $ 6.89
    Original price
    $ 6.89
    $ 6.89 - $ 6.89
    Current price $ 6.89
  • Original price $ 21.69 - Original price $ 21.69
    Original price
    $ 21.69
    $ 21.69 - $ 21.69
    Current price $ 21.69

    Foster 3603GS, 3 Series, Industrial Coupler, Automatic, 1/4" Hose Barb, Brass, Steel

    In stock

    Series: 3 Part Number: 3603GS Interchange: Industrial, I/M Body: 1/4" Coupler, Automatic Thread: 1/4" Hose Barb Material: Heavy-Duty Brass...

    View full details
    Original price $ 21.69 - Original price $ 21.69
    Original price
    $ 21.69
    $ 21.69 - $ 21.69
    Current price $ 21.69
  • Original price $ 14.29 - Original price $ 14.29
    Original price
    $ 14.29
    $ 14.29 - $ 14.29
    Current price $ 14.29

    Foster 2903, 3 Series, Industrial Coupler, Manual, 1/8" Male NPT, Brass, Steel

    In stock

    Series: 3 Part Number: 2903 Interchange: Industrial, I/M Body: 1/4" Coupler, Manual Thread: 1/8" Male NPT, MPT Material: Heavy-Duty Brass,...

    View full details
    Original price $ 14.29 - Original price $ 14.29
    Original price
    $ 14.29
    $ 14.29 - $ 14.29
    Current price $ 14.29
  • Original price $ 4.29 - Original price $ 4.29
    Original price
    $ 4.29
    $ 4.29 - $ 4.29
    Current price $ 4.29

    Foster 12-3B, 3 Series, Industrial Plug, 1/8" Male NPT, Brass

    In stock

    Series: 3 Part Number: 12-3B Interchange: Industrial Body: 1/4" Plug Thread: 1/8" Male NPT, MPT Material: Heavy-Duty Brass Rated Pressure...

    View full details
    Original price $ 4.29 - Original price $ 4.29
    Original price
    $ 4.29
    $ 4.29 - $ 4.29
    Current price $ 4.29
  • Original price $ 7.99 - Original price $ 7.99
    Original price
    $ 7.99
    $ 7.99 - $ 7.99
    Current price $ 7.99

    Foster 14-3B, 3 Series, Industrial Plug, 3/8" Male NPT, Brass

    In stock

    Series: 3 Part Number: 14-3B Interchange: Industrial Body: 1/4" Plug Thread: 3/8" Male NPT, MPT Material: Brass Rated Pressure: 300 psi ...

    View full details
    Original price $ 7.99 - Original price $ 7.99
    Original price
    $ 7.99
    $ 7.99 - $ 7.99
    Current price $ 7.99
  • Original price $ 13.69 - Original price $ 13.69
    Original price
    $ 13.69
    $ 13.69 - $ 13.69
    Current price $ 13.69

    Foster 3703, 3 Series, Industrial Coupler, Manual, 3/8" Hose Barb, Brass, Steel

    In stock

    Series: 3 Part Number: 3703 Interchange: Industrial, I/M Body: 1/4" Coupler, Manual Thread: 3/8" Hose Barb Material: Heavy-Duty Brass, Ste...

    View full details
    Original price $ 13.69 - Original price $ 13.69
    Original price
    $ 13.69
    $ 13.69 - $ 13.69
    Current price $ 13.69
  • Original price $ 11.69 - Original price $ 11.69
    Original price
    $ 11.69
    $ 11.69 - $ 11.69
    Current price $ 11.69

    Foster SG3703, 3 Series, Industrial Coupler, Manual, Sleeve Guard, 3/8" Hose Barb, Brass

    In stock

    Series: 3 Part Number: SG3703 Interchange: Industrial, I/M Body: 1/4" Coupler, Manual, Sleeve Guard Thread: 3/8" Hose Barb Material: Heavy...

    View full details
    Original price $ 11.69 - Original price $ 11.69
    Original price
    $ 11.69
    $ 11.69 - $ 11.69
    Current price $ 11.69
  • Original price $ 19.49 - Original price $ 19.49
    Original price
    $ 19.49
    $ 19.49 - $ 19.49
    Current price $ 19.49

    Foster FM3603, 3 Series, Industrial Coupler, Automatic, 1/4" Hose Barb, Brass

    In stock

    Series: 3 Part Number: FM3603 Interchange: Industrial, I/M Body: 1/4" Coupler, Automatic Thread: 1/4" Hose Barb Material: Heavy-Duty Brass...

    View full details
    Original price $ 19.49 - Original price $ 19.49
    Original price
    $ 19.49
    $ 19.49 - $ 19.49
    Current price $ 19.49
  • Original price $ 13.19 - Original price $ 13.19
    Original price
    $ 13.19
    $ 13.19 - $ 13.19
    Current price $ 13.19

    Foster 3203, 3 Series, Industrial Coupler, Manual, 3/8" Female NPT, Brass, Steel

    In stock

    Series: 3 Part Number: 3203 Interchange: Industrial, I/M Body: 1/4" Coupler, Manual Thread: 3/8" Female NPT, FPT Material: Heavy-Duty Bras...

    View full details
    Original price $ 13.19 - Original price $ 13.19
    Original price
    $ 13.19
    $ 13.19 - $ 13.19
    Current price $ 13.19
  • Original price $ 8.19 - Original price $ 8.19
    Original price
    $ 8.19
    $ 8.19 - $ 8.19
    Current price $ 8.19

    Foster 165-3, 3 Series, Industrial Plug, 5/16" Hose Barb, Steel

    In stock

    Series: 3 Part Number: 165-3 Interchange: Industrial Body: 1/4" Plug Thread: 5/16" Hose Barb Material: Heavy-Duty Steel Rated Pressure: ...

    View full details
    Original price $ 8.19 - Original price $ 8.19
    Original price
    $ 8.19
    $ 8.19 - $ 8.19
    Current price $ 8.19
  • Original price $ 3.69 - Original price $ 3.69
    Original price
    $ 3.69
    $ 3.69 - $ 3.69
    Current price $ 3.69

    Foster 17-3, 3 Series, Industrial Plug, 3/8" Hose Barb, Steel

    In stock

    Series: 3 Part Number: 17-3 Interchange: Industrial Body: 1/4" Plug Thread: 3/8" Hose Barb Material: Heavy-Duty Steel Rated Pressure: 30...

    View full details
    Original price $ 3.69 - Original price $ 3.69
    Original price
    $ 3.69
    $ 3.69 - $ 3.69
    Current price $ 3.69
  • Original price $ 35.79 - Original price $ 35.79
    Original price
    $ 35.79
    $ 35.79 - $ 35.79
    Current price $ 35.79

    Foster SV3103, 3 Series, Industrial Coupler, Manual, 1/4" Male NPT, Safety Valve, Brass, Steel

    In stock

    Series: 3 Part Number: SV3103 Interchange: Industrial, I/M Body: 1/4" Coupler, Manual, Safety Valve Thread: 1/4" Male NPT, MPT Material: H...

    View full details
    Original price $ 35.79 - Original price $ 35.79
    Original price
    $ 35.79
    $ 35.79 - $ 35.79
    Current price $ 35.79
  • Original price $ 35.79 - Original price $ 35.79
    Original price
    $ 35.79
    $ 35.79 - $ 35.79
    Current price $ 35.79

    Foster SV3003, 3 Series, Industrial Coupler, Manual, 1/4" Female NPT, Safety Valve, Brass, Steel

    In stock

    Series: 3 Part Number: SV3003 Interchange: Industrial, I/M Body: 1/4" Coupler, Manual, Safety Valve Thread: 1/4" Female NPT, FPT Material:...

    View full details
    Original price $ 35.79 - Original price $ 35.79
    Original price
    $ 35.79
    $ 35.79 - $ 35.79
    Current price $ 35.79
  • Original price $ 24.89 - Original price $ 24.89
    Original price
    $ 24.89
    $ 24.89 - $ 24.89
    Current price $ 24.89

    Foster 1713GB, 3 Series, Industrial Coupler, Automatic, 3/8" Hose Barb (Push-On), Brass

    In stock

    Series: 3 Part Number: 1713GB Interchange: Industrial, I/M Body: 1/4" Coupler, Automatic Thread: 3/8" Hose Barb (Push-On) Material: Heavy-...

    View full details
    Original price $ 24.89 - Original price $ 24.89
    Original price
    $ 24.89
    $ 24.89 - $ 24.89
    Current price $ 24.89
  • Original price $ 26.59 - Original price $ 26.59
    Original price
    $ 26.59
    $ 26.59 - $ 26.59
    Current price $ 26.59

    Foster 1513GB, 3 Series, Industrial Coupler, Automatic, 1/4" Hose Barb (Push-On), Brass

    In stock

    Series: 3 Part Number: 1513GB Interchange: Industrial, I/M Body: 1/4" Coupler, Automatic Thread: 1/4" Hose Barb (Push-On) Material: Heavy-...

    View full details
    Original price $ 26.59 - Original price $ 26.59
    Original price
    $ 26.59
    $ 26.59 - $ 26.59
    Current price $ 26.59
  • Original price $ 25.39 - Original price $ 25.39
    Original price
    $ 25.39
    $ 25.39 - $ 25.39
    Current price $ 25.39

    Foster 3703GB, 3 Series, Industrial Coupler, Automatic, 3/8" Hose Barb, Brass

    In stock

    Series: 3 Part Number: 3703GB Interchange: Industrial, I/M Body: 1/4" Coupler, Automatic Thread: 3/8" Hose Barb Material: Heavy-Duty Brass...

    View full details
    Original price $ 25.39 - Original price $ 25.39
    Original price
    $ 25.39
    $ 25.39 - $ 25.39
    Current price $ 25.39
  • Original price $ 24.29 - Original price $ 24.29
    Original price
    $ 24.29
    $ 24.29 - $ 24.29
    Current price $ 24.29

    Foster 3653GB, 3 Series, Industrial Coupler, Automatic, 5/16" Hose Barb, Brass

    In stock

    Series: 3 Part Number: 3653GB Interchange: Industrial, I/M Body: 1/4" Coupler, Automatic Thread: 5/16" Hose Barb Material: Heavy-Duty Bras...

    View full details
    Original price $ 24.29 - Original price $ 24.29
    Original price
    $ 24.29
    $ 24.29 - $ 24.29
    Current price $ 24.29
  • Original price $ 24.09 - Original price $ 24.09
    Original price
    $ 24.09
    $ 24.09 - $ 24.09
    Current price $ 24.09

    Foster 3303GB, 3 Series, Industrial Coupler, Automatic, 3/8" Male NPT, Brass

    In stock

    Series: 3 Part Number: 3303GB Interchange: Industrial, I/M Body: 1/4" Coupler, Automatic Thread: 3/8" Male NPT, FPT Material: Heavy-Duty B...

    View full details
    Original price $ 24.09 - Original price $ 24.09
    Original price
    $ 24.09
    $ 24.09 - $ 24.09
    Current price $ 24.09
  • Original price $ 24.99 - Original price $ 24.99
    Original price
    $ 24.99
    $ 24.99 - $ 24.99
    Current price $ 24.99

    Foster 3203GB, 3 Series, Industrial Coupler, Automatic, 3/8" Female NPT, Brass

    In stock

    Series: 3 Part Number: 3203GB Interchange: Industrial, I/M Body: 1/4" Coupler, Automatic Thread: 3/8" Female NPT, FPT Material: Heavy-Duty...

    View full details
    Original price $ 24.99 - Original price $ 24.99
    Original price
    $ 24.99
    $ 24.99 - $ 24.99
    Current price $ 24.99
  • Original price $ 22.89 - Original price $ 22.89
    Original price
    $ 22.89
    $ 22.89 - $ 22.89
    Current price $ 22.89

    Foster 3103GB, 3 Series, Industrial Coupler, Automatic, 1/4" Male NPT, Brass

    In stock

    Series: 3 Part Number: 3103GB Interchange: Industrial, I/M Body: 1/4" Coupler, Automatic Thread: 1/4" Male NPT, FPT Material: Heavy-Duty B...

    View full details
    Original price $ 22.89 - Original price $ 22.89
    Original price
    $ 22.89
    $ 22.89 - $ 22.89
    Current price $ 22.89
  • Original price $ 31.49 - Original price $ 31.49
    Original price
    $ 31.49
    $ 31.49 - $ 31.49
    Current price $ 31.49

    Foster 2903GB, 3 Series, Industrial Coupler, Automatic, 1/8" Male NPT, Brass

    In stock

    Series: 3 Part Number: 2903GB Interchange: Industrial, I/M Body: 1/4" Coupler, Automatic Thread: 1/8" Male NPT, FPT Material: Heavy-Duty B...

    View full details
    Original price $ 31.49 - Original price $ 31.49
    Original price
    $ 31.49
    $ 31.49 - $ 31.49
    Current price $ 31.49
  • Original price $ 21.99 - Original price $ 21.99
    Original price
    $ 21.99
    $ 21.99 - $ 21.99
    Current price $ 21.99

    Foster 2803GB, 3 Series, Industrial Coupler, Automatic, 1/8" Female NPT, Brass

    In stock

    Series: 3 Part Number: 28033GB Interchange: Industrial, I/M Body: 1/4" Coupler, Automatic Thread: 1/8" Female NPT, FPT Material: Heavy-Dut...

    View full details
    Original price $ 21.99 - Original price $ 21.99
    Original price
    $ 21.99
    $ 21.99 - $ 21.99
    Current price $ 21.99