Collars H 60-90 are ideal for connecting waterproof roof membranes with through pipes or installations, ensuring watertightness. With a smooth flange and tapered tang, they are compatible with PVC membranes and weather-resistant. Collars, H 60-90, are used to connect waterproof roof membranes with any through pipes or installations in the roof. The slightly tapered tang facilitates their installation in through pipes. They have excellent resistance to deterioration caused by the sun, ozone and other atmospheric or chemical agents normally present.