The upper flaring serves to accommodate silicone or other sealant, to provide a secure long term seal.
Like the roof outlets they are equipped with two rings with a gasket function.
The elastic material that they are made of ensures a long term seal.
Slightly conical to enable laying in rain water pipes.
Resistant to deterioration by the sun, ozone and other atmospheric or chemical agents normally present.
They have excellent flexibility even at low temperatures. Mechanical characteristics remain unaltered over time.
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