Description

Overview

The 8mm air brake connector joins metric 8mm nylon tube to a 1/4 NPT female port in a trailer or heavy-vehicle pneumatic circuit. Its straight body suits installations where the tube approaches a valve, manifold or reservoir port in line with the threaded connection.

Features

• Push-to-connect port suits 8mm outside-diameter nylon air tube.
• 1/4 NPT male thread connects to a matching tapered female port.
• Factory-applied thread sealant is supplied on the male thread.
• Release collet allows the tube to be removed during servicing.

Specifications and Materials

This straight connector uses a brass hex body with an integral tube-gripping collet and internal seal. It comes as one complete fitting with pre-applied thread sealant, so no separate tube nut, olive or compression sleeve is required.

Part number: 88-M003-08N04.

Technical dimensions and matching NPT configurations are available in the Alkon metric air brake fitting catalogue

Compatibility and Fitment

Confirm the tube measures 8mm across its outside diameter and the receiving port has a 1/4 NPT female thread. Do not substitute 5/16in imperial tube, BSP thread or a straight metric thread, as these connections can appear similar but seal differently. These cross-references show where this part replaces the part numbers and applications listed. Some installations may need minor changes. MDQ68DOT804, 35-M680804, 35M680804, MAQ68-DOT-8X4, MAQ68DOT8X4, M1868X8X4

Related Parts

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

Compliance and Safety

Depressurise the air system before removing or installing the connector. Cut the tube square, discard scored or oval sections and push the tube fully through the collet. Keep the factory-applied thread coating clean, tighten through the brass hex and avoid forcing the tapered thread into an incompatible port. Restore pressure gradually and leak-test both ends.

Trailer Applications

Trailer workshops fit this connector where metric air line must terminate at an imperial threaded port. Applications include brake valves, suspension controls, air tanks, pneumatic manifolds and auxiliary air equipment using 8mm tubing and a straight 1/4 NPT connection.

Cross-reference and Suitability

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

Why Choose ICS Trailers

ICS Trailers supplies metric and imperial pneumatic fittings for trailer brake and suspension repairs. For identification help, send a clear photo and confirm the tube outside diameter, thread diameter and whether the receiving port uses NPT, BSP or metric thread.

Browse more Air Fittings