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 through pipes. They have excellent resistance to deterioration caused by the sun, ozone and other atmospheric or chemical agents normally present. The elasticity of the raw material from which they are made allows for excellent flexibility even at low temperatures, enabling the mechanical and physical properties to remain unchanged for a long time. The completely smooth flange improves bonding with PVC membranes. The slightly tapered tang facilitates installation in through pipes, and the completely smooth flange assists joins with PVC coverings. The Collars are fully compatible with prefabricated PVC membranes. Thorough cleaning of the Collar and the synthetic felt is recommended near the area where the collar will be joined.