mike wrote:
Are there any situations where it's acceptable to use a bottle trap
with a 38mm seal on a kitchen sink or do Building Regs always require
a 76mm seal?

Also, what's a "half trap"?

Who says you have to use a 76mm? - there's no BCO going to look under your
sink


http://www.toolstation.com/shop/Plum.../sd2907/p52069

Isn't it either a trap or just a bit of pipe?

A half trap is just like what's in the picture - you can see that where the
trap comes back up, the pipe stops and you need to manually attach a bend to
make an entire trap.

--
Phil L
RSRL Tipster Of The Year 2008