They are fitted with a smooth flange to improve adhesion to the prefabricated PVC membrane; they have two rings on the shank which acts as drain trap seals between the roof outlet and the rain water drain.
It is manufactured with a hightly resilient material to give it a long lasting tight seal.
The shank is serrated on the inside to firmly fix any leaf-excluder or gravel-excluder that may be fitted to the roof outlet.
Resistant to deterioration by the sun, ozone and other agents or chemicals normally found in the atmosphere. They have excellent flexibitility even at low temperatures. The mechanical properties are maintained in the long term. They are compatible with prefabricated synthetic membranes in PVC.
We recommend the gully and roofing felt be carefully cleaned before adhesion.
|