The spigot is 250mm long and is inserted down inside of the HDPE drainpipe. This gives ample assurance that no water can back up behind the rubber and onto the deck. The spigot is slightly cone shaped and ribbed. This helps with installation into the hole, and prevents water passing back up behind the spigot.
http://www.wallbarn.com/products/roof-outlets-vents/roof-outlets-collars/epdm/epdm-circular-outlet-for-mechanical-fixing/
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