Instantor press fittings when pressed correctly delivers water tight seal in seconds. Instantor Press fittings are designed for use in sanitary water supply and heating systems. WRAS approved. Brass body manufactured from CW617N brass, NASI certified to EN ISO 21003. Suitable to use with Aluminium plastic composite / PE-X / PE-RT / PB / Steel Plastic Composite. WRAS approved. Brass body manufactured from CW617N brass, NASI certified to EN ISO 21003. Suitable to use with Aluminium plastic composite / PE-X / PE-RT / PB / Steel Plastic Composite.