ISO 17885:2015 specifies the requirements and test methods for mechanical fittings intended to join plastic pressure piping systems including transition fittings to metal pipes for the following: ? supply of gaseous fuels (GAS); ? supply of water for human consumption (W), including raw water prior to treatment and for the supply of water for general purpose, as well as underground drainage and sewerage under pressure (P); ? supply of water for irrigation (I); ? industrial applications (IS). ISO 17885:2015 is applicable only to mechanical fittings with operating-temperature and pressure limits as indicated in the relevant systems standards.