Re: y valve won' turn
I have used it on my Live well and bait tank set up before...it works but I am not sure about any long term effects though LOL If you see a post about leaky PVC from me you will know !!
Seriously though I cannot say enough about PBBlaster it has saved many a frusterating afternoon.
(Just remember my Gelcoat comment it is horrible on slightly faded gelcoat)_