Thanks for the heads up!
I see a cover in the pic, did you have that cover over the valve? I wonder if by leaving that cover off if the light would retard the root growth into that area?
Yes the cover was on the whole time
I think it’s best to leave them on so no crap gets in there. Interesting thought tho… maybe a screen instead of the plastic cover?
If you feel that you need something to cover it, screen or even plastic wrap (the food type) should work just fine. If you do give it a try, let us know as I’m curious to know how it works out.