10-25-2018, 12:36 PM
If it’s empty you might try filling it with water to the correct level and then drain it into a big container (over 20 gallons) and see how much you need...
Karen & Adrian Abshire
1998 2 slide 45' Newell Coach 498
Prior: 1985 Foretravel ORED 35, 1988 38' Foretravel U280, 2000 Foretravel 42' U320, 1990 Bluebird Wanderlodge WB40