Description

1/8″ MNPT × 1/4″ OD Quick-Connect Check Elbow Fitting for RO Membrane Waste Line

This Quick-Connect Check Elbow Fitting is designed for use on the waste (drain) port of RO membrane housings
in traditional under-sink reverse osmosis systems. The integrated check valve helps maintain proper flow direction while the
90-degree elbow design allows for clean, space-saving tubing routing.

Purpose

☑ Connects RO membrane housing waste line ports to 1/4″ OD tubing

☑ Prevents backflow with built-in check valve

☑ Ideal for traditional under-sink RO systems

Key Features

☑ Integrated check valve for proper waste water flow control

☑ 90° elbow design for compact installation and reduced tubing stress

☑ Quick-connect (push-to-connect) tubing connection

☑ Compatible with standard 1/4″ OD RO tubing

Installation Notes (Important)

☑ The threaded connection is 1/8″ MNPT and requires plumbing thread seal tape (PTFE/Teflon tape)
to ensure a secure, leak-free seal.
☑ Wrap plumbing tape clockwise around the male threads before installation.
☑ Hand-tighten first, then tighten slightly with a wrench if needed. Do not overtighten.
☑ Push 1/4″ OD tubing fully into the quick-connect port until it seats completely.

Specifications

Thread Size: 1/8″ MNPT (Male National Pipe Thread)

Tubing Size: 1/4″ OD (Outside Diameter)

Connection Type: Quick-Connect Elbow with Check Valve

Application: RO membrane housing waste (drain) line

System Type: Traditional under-sink reverse osmosis systems