This standard specifies the requirements for special fittings , adaptors and compatible accessories made form vitrified clay and / or other suitable materials for use with vitrified clay pipes and fittings in drainage and sewerage systems . It does not apply to items which are specified in other parts of EN 295 . Any additional requirement for particular items art given in the annexes to this part of the standard . Where this standard provides for different systems of jointing dimensions , different lengths and different types of fittings , the specifiers / purchasers may select according to their requirements .