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. 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 perforated flange improves adhesion with bituminous sheaths. The Collars are perfectly compatible with APP and SBS type prefabricated bituminous membranes and with bituminous coats. For maximum performance, sandwich laying between two layers of membrane is recommended. To improve adhesion, the Collars can be pre-coated with a light coat of primer.