As most know, it's near impossible to repair a leak in a camper fresh water tank as they are made of HDPE - High Density Polyethene that is near impossible to glue or repair. HDPE is the same 'plastic' used to make milk jugs.
Most recommended it to use a 'plastic welding' process and a plastic welder isn't inexpensive whatsoever.
I contacted Cruiser who provided me with the name of mfg of the fresh water tanks. I contacted them and they are a discontinued item...so none available.
On my unit, the drain valve screws into a boss on the tank and the boss developed a crack where it joins the bottom of the tank - and leaked water.
I tried all kinds of glues and epoxy's with zero success. Finally after another internet search, I located an epoxy called Infinity MMA-500 which I ordered from 'www.gluegun.com' and was promptly received.
It's easy to apply, hardly any prepwork necessary and is easy to use like squeezing caulk from a gun.
THE STUFF REALLY WORKS and it sealed up the crack in the fresh water tank so no more leak!!!
Passing it along for your information.