This document specifies tests and requirements for discharge lines closures, a compressed natural gas (CNG) fuel system component intended for use on the types of motor vehicles defined in ISO 3833.

This document is applicable to vehicles (mono-fuel, bi-fuel or dual-fuel applications) using natural gas in accordance with the ISO 15403-1. It is not applicable to the following:

a)       liquefied natural gas (LNG) fuel system components located upstream of, and including, the vaporizer;

b)       fuel containers;

c)        stationary gas engines;

d)       container-mounting hardware;

e)       electronic fuel management;

f)         refuelling receptacles.