When you install a P-trap for a bathroom sink is it OK to have it at a
bit of an angle or must it be completely vertical? My situation here
is a bit odd and I was advised not use use 90 degree fittings as they
can restrict flow. So the best fit I can achieve is where the p-trap
is slighly off vertical. Every p-trap I have ever seen is completely
vertical but I have never heard that it must be.