Ok so got my fill and drain pieces, got circle hole bit size it told me to. But now it is to big of hole and doesn't fit how can I remedy this problem like how can I make them for water tightly.
If the hole you made is too large, either get a larger fitting or patch the hole and to it correctly. Measure twice, cut once.
What size fitting are you using and what size hole did you drill? What size hose are you using? Maybe you can just go up a size and use a reducer at the pump connection. Larger hose makes for faster flooding and faster draining, which makes the table more efficient (in my experience). If you're using 1/2 inch tubing, I would personally up to 5/8 or 3/4 inch. If your using the 3/8 tubing I would definitely up it to at least 1/2 inch ID. They also make fittings with with wider flanges and flat rubber washers that will work if the hole is just a little too big.
Yea like 2 pieces of paper thick gap really small jus o rings that can with it are not big enough to make up for it
Use silicon. I made my ebb and grow bucket the floater hole a little to big and it start leaking, I just seal it up with water resistant sealant.