A 90° elbow that connects standard 1/4″ OD RO tubing to a 1/8″ MNPT threaded port — the fitting for RO membrane housings and components that use the smaller 1/8″ thread, with a right-angle turn for tidy routing. Push-to-connect tube side, threaded port side. Sold as a 2-pack with quantity discounts.

What it does

This 90° elbow connects standard 1/4″ OD tubing to a 1/8″ Male NPT threaded port. The tube side is push-to-connect — just push the tubing in for a tight, leak-resistant grip. The threaded side is a standard 1/8″ MNPT connection, sealed with PTFE (Teflon) tape or an approved thread sealant.

The 90° elbow shape turns the tubing at a right angle right at the port — keeping the run compact and avoiding sharp kinks in tight spaces under the sink or inside an RO enclosure. The 1/8″ thread is the smaller port size found on many RO membrane housings and components, so this is the elbow you reach for when your port is 1/8″ rather than the more common 1/4″.

Key benefits

• ✓1/8″ MNPT × 1/4″ OD, 90° — adapts standard 1/4″ tubing to a smaller 1/8″ port at a right angle
• ✓For 1/8″ ports — common on RO membrane housings and filtration components
• ✓Push-to-connect tube side — tool-free; push the tube in, press the collet to release
• ✓90° routing — clean right-angle turn, reduces kinks and strain in tight spaces
• ✓Food-grade material, suitable for potable water applications
• ✓Automatic quantity discounts — 2-pack, keep spares in the parts drawer

Specifications

Compatibility

Often used with

Good to know before you buy

• Wrap the 1/8″ thread with PTFE (Teflon) tape (2–3 turns) or apply an approved thread sealant before installing. Unlike push-fit-only fittings, this threaded side needs tape to seal. Hand-tighten — do not over-torque, which can crack the plastic.
• Push the tubing fully into the quick-connect side until it seats. A firm push past the initial resistance locks it in. Give the tube a gentle tug to confirm it’s held.
• To remove tubing: press and hold the collet ring flat against the fitting, then pull the tube straight out.
• Confirm your port is 1/8″ MNPT and your tubing is 1/4″ OD — the two most common mismatches on this adapter.
• For cold / potable water only — not for hot-water or high-pressure lines.