Description

Overview

The 8mm air brake union joins two matching sections of 8mm metric nylon tube in a straight push-in connection. It suits repairs and extensions where the pneumatic line must continue in the same direction without a threaded port, elbow or reducing connection.

Features

• Equal push-in ports connect 8mm tube to 8mm tube.
• Straight double-union layout maintains the original air-line route.
• Brass body contains the tube-gripping collets and pneumatic seals.
• Release collars allow either tube section to be removed during servicing.

Specifications and Materials

This D.O.T. fitting combines two equal 8mm push-to-connect ports in one straight brass union. The tube installs without separate compression nuts, olives, ferrules or threaded adaptors.

Part number: 88-M004-08.

See the official D.O.T. push-in fitting guide

Compatibility and Fitment

Measure both tube sections across the outside diameter and confirm they are 8mm metric tube. Do not treat 5/16in imperial tube as interchangeable solely because its outside diameter appears similar. Also check that a straight equal union suits the repair rather than a reducer, elbow, tee or bulkhead fitting. These cross-references show where this part replaces the part numbers and applications listed. Some installations may need minor changes. MDQ62DOT8, 35-M6208, 35M6208, MAQ62-DOT-8, MAQ62DOT8, M1862X8, HPMTB8, 97450305

Related Parts

Check the related service parts below against the trailer setup before ordering.

Compliance and Safety

Depressurise the pneumatic circuit before cutting or disconnecting the line. Cut each tube end square and remove any scored, crushed, oval or heat-damaged section. Push both tubes fully into the union, then pull back gently to confirm each collet has engaged. Support the repaired line to prevent vibration or movement from loading the connection, then restore pressure gradually and leak-test both ends.

Trailer Applications

Workshops fit this union when repairing 8mm pneumatic lines used in trailer air brake controls, air suspension plumbing and auxiliary air circuits. Its equal straight-through connections suit a cut or replaced tube section where the original line direction and diameter must remain unchanged.

Cross-reference and Suitability

This part cross-references to or suits the following equivalent part numbers and compatible alternatives:

Why Choose ICS Trailers

Metric and imperial tube sizes can be difficult to distinguish by eye, especially around the 8mm size. Confirm the tube outside diameter with callipers, or send a clear photo and measurement if the existing fitting is difficult to identify.

Browse more Air Fittings