A push-to-connect 90° reducer elbow that connects 1/4″ OD tubing to 3/8″ OD tubing — the cross-size bridge between two common RO tubing sizes. No thread, no tape, both ends push-fit. Sold as a 2-pack.

What it does

This elbow reducer connects 1/4″ OD tubing on one end to 3/8″ OD tubing on the other at a 90° angle. Both ends are push-to-connect — no threads, no tape. It smoothly transitions between the two most common RO tubing sizes while making a clean 90° turn.

Common use: bridging a 1/4″ countertop or under-sink RO line to a 3/8″ main supply line or pressure tank connection. Also useful wherever a system mixes both tubing sizes.

Key benefits

• ✓1/4″ QC × 3/8″ QC — cross-size reducer, push-fit both ends
• ✓90° elbow — size transition + direction change in one fitting
• ✓No tape, no tools — O-ring sealed push-fit
• ✓Bridges 1/4″ and 3/8″ tubing sections
• ✓Works with RO systems, inline filters & mixed-size plumbing
• ✓2-pack with automatic quantity discounts

Specifications

Compatibility

Often used with

Good to know before you buy

• Confirm which port is 1/4″ and which is 3/8″ before installing — push the matching tubing into each side.
• Cut tubing square before pushing in.
• O-ring sealed — no thread tape needed.
• Check both connections for leaks before pressurizing.