I have a mix of taps, but over the years have gone mostly to the "tree saver" taps with the check valve (little ball in it).
I am exclusively drop lines to buckets.
Without looking, I think the "tree savers" are 5/16".
Is there a "vented" version of plastic taps?
Looking at a receipt from Leader in 2012 I bought 10 taps ... item #4778S description ...Spout UNVENTED 7/16".
What about when you go with Drop lines to a mainline and it is gravity only (no vacuum), should the line be vented?
Any input will be appreciated.