Vitreous pipe matt black

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As with all vitreous pipe the bottom end narrows to a lesser diameter to enable insertion into other pieces of pipe (male is always on top). Key reason is that any condensation that trickles down inside pipe cannot escape. Straight lengths can be cut using a grinder and 115mm cutting disc (available from this online store). Why is there a hole in the recessed section - so the pipes can be hung on a wire for spraying during manufacture ;-)