Whale Stem Elbow 15mm Part Number WX1522B The Whale Stem Elbow fitting has a 15mm female fitting and 15mm male stem, for use with Whale push-fit semi- rigid pipework. The Whale Push-fit fittings and pipework design ensures easy installation and re-usability of components. The simple two step installation procedure does not require special tools to make a watertight connections, enabling the system easy to install. Genuine Whale Part