VIEGA reducing tee 18×15×18 mm, compression fitting, model 5130R181518

The VIEGA reducing tee 18×15×18 mm, compression fitting, model 5130R181518 is a compact plumbing accessory designed to connect three pipe runs with a reduction on one branch from 18 mm to 15 mm. Manufactured by VIEGA, this reducing tee is intended for use in potable water, heating and general plumbing installations where a reliable, space-efficient transition between pipe sizes is required. The compression-style connections provide a leak-resistant joint when installed on compatible copper or similar rigid pipes.

Advantages

This reducing tee offers a compact footprint and straightforward compression connections that eliminate the need for soldering or specialized tools. Its construction delivers mechanical stability and consistent alignment of pipe runs, helping maintain system integrity during assembly and operation. The size reduction feature allows integration of smaller-diameter branches into existing 18 mm pipelines without additional adapters or extensive rework.

Suitable for

• Residential and commercial potable water distribution
• Heating circuits and radiator branch connections
• Plumbing repairs where a reduction from 18 mm to 15 mm is required
• Installations using copper or compatible rigid pipe systems with compression fittings

Key specifications

• Material: compression fitting compatible with copper and similar rigid pipes
• Nominal dimensions: 18 mm × 15 mm × 18 mm (branch reduction from 18 to 15 mm)
• Connection type: compression joint on all three ends
• Application: water and heating systems
• Design: reducing tee for three-way connection with one reduced outlet

How to use

Prepare pipe ends by cutting square and removing burrs, ensuring the pipes are clean and free of debris. Slide the compression nuts and ferrules onto the pipes, insert each pipe end fully into the fitting until it seats, then hand-tighten the compression nuts. Finalize assembly by tightening the nuts to the manufacturer-recommended torque or until a secure, leak-free joint is achieved, using appropriate wrenches. Verify alignment and test the system under operating pressure to confirm seals before completing insulation or enclosure work.

Usage recommendations

Use this reducing tee in installations following local plumbing codes and VIEGA installation guidelines. Select compatible pipe material and correct pipe insertion depth. Do not use compression fittings on soft or flexible tubing not specified for this connection type. Periodically inspect compression joints for tightness and signs of leakage after initial commissioning and during routine maintenance.