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This document specifies the characteristics of fusion fittings made from polyethylene (PE) as well as of mechanical fittings for buried or above ground applications, intended for the conveyance of: water for human consumption; — raw water prior to treatment; — drains and sewers under pressure; — vacuum sewer systems; — water for irrigation — water for other purposes, with the exception of industrial applications. The intended uses include sea outfalls, laid in water and suspended below bridges. NOTE 1 Attention is drawn to Clause 6 of this document for PE components for the conveyance of water intended for human consumption and raw water prior to treatment. Components manufactured for water for other purposes, drains and sewers, and vacuum sewer systems are possibly not suitable for water supply for human consumption. PE pipe systems for industrial applications and irrigation with limited pressure exposure are not covered by this document. NOTE 2 Industrial application is covered by ISO 15494 [3], irrigation with limited pressure exposure is covered by ISO 8779:2020 [4] . This document also specifies the test parameters for the test methods referred to in this document. In conjunction with iso:proj:72183ISO 4427-1, iso:proj:72184ISO 4427-2, and iso:proj:72186ISO 4427-5, this document is applicable to PE pipes, fittings and valves, their joints and to joints with components made of PE and other materials, intended to be used under the following conditions: a) a maximum allowable operating pressure (PFA) up to and including 25 bar1; b) an operating temperature of 20 °C as the reference design temperature. For applications operating at constant temperatures greater than 20 °C and up to and including 50 °C, derating coefficients are specified in ISO/DIS 4427-1, Annex A. The ISO 4427 series cover a range of maximum allowable operating pressures and gives requirements concerning colours. These fittings can be of the following types: — electrofusion socket fittings; — electrofusion saddle fittings; — spigot end fittings (for butt fusion using heated tools and electrofusion); — socket fusion fittings (see Annex A); — mechanical fittings; — fabricated fittings (see Annex B). NOTE 3 The fittings can be, for example, in the form of couplers, saddles, equal and reduced tees, reducers, elbows, bends or end caps. It is the responsibility of the purchaser or specifier to make the appropriate selections from these aspects, taking into account their particular requirements and any relevant national guidance or regulations and installation practices or codes. 1 1 bar = 0,1 MPa = 105 Pa; 1 MPa = 1 N/mm2.