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

Overview

The John Guest Female NPT x Push-Connect Adapter makes it easy to adapt your Neptune Systems DOS for use with standard 1/4" RO tubing. By replacing the DOS’s compression fittings, this adapter threads directly onto the 1/8” male NPT connection, providing a leak-free, secure fit. Perfect for longer tubing runs, such as remote automatic water change reservoirs or drain lines, this adapter helps create a professional-grade installation when paired with 1/4” RO tubing and mounting brackets.

Key Features

• DOS-Compatible – Converts Neptune Systems DOS connections to standard 1/4" RO tubing.

• Push-Connect Fitting – Quick and secure connection for standard 1/4” RO tubing.

• Durable Construction – Made of white polypropylene with EPDM O-ring.

• Professional Setup – Ideal for long tubing runs and organizing with 1/4” tubing brackets.

• Certified Safe – FDA-approved material; NSF Certified 51 & 61.

What’s Included

• (1) John Guest 1/8” FNPT x 1/4” Push-Connect Adapter