Gray /black water tank removal?

[Bmwtech]

When a first started working on my 99 pace arrow it had been sitting for 5 years. This was my parents RV but long story short it was gifted to me. I’ve put a lot of work into it now. But one of the first things I had to do was remove the fuel tank since fuel doesn’t like sitting for so long. After I removed it some reason I can’t remember why I drill a hole right above it. Well at the time nothing was seen to make me think I drilled into the gray tank. Just a small 1/8” hole but enough now to leak.

How do I get to the tank or remove the tank? I’m in remodel mode so most of the interior is being replaced due to age, damage or just ugliness.

[House Husband]

Maybe open up the hole in the floor below the gray tank and use a rubber plug?
Something like this. Test Plug for 1/2" Copper Pipe - Model Number: 13-1811

Richard

[Bmwtech]

Well when the gas tank was out there was no way to go that route it was too thick. Would of ended cutting into the holding tank. Cause when I drilled that hole it went through the floor and then into the tank really fast.