Custom Roto-Molding H57 RV Holding Tank

*Manufactured from prime density polyethylene. *Calls for use of hollow noticed for install of grommets. *For three” installing use a 3 7/eight” hollow noticed. *For two” installing use a 2 three/four” hollow noticed. *For 1 half” installing use a 2 1/four” hollow noticed. *After grommet is seated in tank, higher lip will have to be sealed with silicone tub caulk. 32 Gallon Preserving Tank