"Had to puzzle out whether the sizes in the rubber collar related to the indentation above or below the digits, but it worked fine. On a flat roof, I'd think that a further "collar" would be a wise investment, to keep the sunlight off the rubber as much as is possible and to deter any descending water away from the rubber/soil pipe interface. Not worth the bother if this slate is installed on a pitched roof."
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Review 4 for FloPlast SP320 End Ventilation Slate Grey