On Monday, 13 May 2019 17:43:34 UTC+1, PeterC wrote:

I'm changing to no trap inside and a waterless trap outside (having tested
it at low temperature to make sure that it doesn't freeze shut). I'll use
black pipe, to resist UV, with about a foot of black downpipe to cover the
trap.

That'll stink, you need the trap right at the tray.


NT