The Alde 1900-518 is a genuine T-shaped rubber drain connector for Alde 22mm wet central-heating systems in caravans and motorhomes. Alde specifies the connector as EPDM 21.4 × 4.25mm, designed for use with the standard 22mm aluminium heating pipe.

It is supplied complete with the spring/band clips and drain plug, so it is the complete drain tee rather than just the rubber connector.