WATER HEATERΚΑΥΣΤΗΡΕΣ WEBASTOΑΝΤΑΛΛΑΚΤΙΚΑWith the Webasto ball check valve, all four tubes have a diameter of 18mm. Case material ABS plastic. Reinforcing brass bushings are inserted into the hose landing sites. It can be used when installing liquid heaters and implementing a scheme for priority hea..