John Guest

1/8" Female NPT X 1/4" Push Connect Adapter

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$4.41 $5.19

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The John Guest Female NPT x Push-Connect Adapter can be used to adapt any 1/8” male NPT threaded plumbing to 1/4” push connect, and is perfect for converting your Neptune Systems® DOS to accept standard 1/4” RO tubing. This adapter can be used to replace the compression fittings on the DOS, threading directly onto the 1/8” threads and providing a leak-free connection. 


RO tubing is a great option for longer tubing runs, and we’ve used this option for applications such as remote automatic water change reservoirs and drain lines. Coupled with the Neat Aquatics 1/4” RO Tubing Brackets, you can keep your tubing clean, organized and out of the way, and achieve a truly professional-looking setup.



  • White polypropylene construction
  • EPDM O-ring
  • FDA approved material
  • NSF Certified 51 & 61



  • Dimensions: .028”L x .026”W x .01”H
  • Material: Polypropylene
  • Inlet/Outlet: 1/8” FPT x 1/4” Push-Connect
  • Max Pressure (Psi): 150
  • Max Temp. (°F): 140


What’s Included?

1x John Guest 1/8 inch FNPT X 1/4 inch Push-Connect Adapter

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Product Questions

Will this work with the BRS dosing pumps as well?
Question by: Kris S on Jul 28, 2022, 8:30 PM
The BRS Two part dosing pump connections are not compatible with threaded fittings. It is possible to connect the dosing tubing into the 1/4" Push connect side of the fitting using https://www.bulkreefsupply.com/mur-lok-stem-adapter-tube-x-hose-stem.html SKU: 200820.
Answer by: Scott Forst (BRS Staff) on Aug 3, 2022, 5:43 PM