M-Profile pressfit fittings. Suitable for drinking water, heating, rainwater, compressed air, fire extinguising systems and sanitary water. Easier to work during installation compared with other pipe systems. O-rings incorporate leak detection indicators. Seals made when green plastic cover (crimp indicator) peels away from the fitting when crimped correctly. Flame-free installation. No torch, no gas, no flux, no system contaminants. 10 year guarantee. DVGW Approved. Maximum working pressure of 5 bar. Operating temperature of -20 degrees to 70 degrees celsius. HNBR O ring.