View Full Version : Grey tanks on 3055RL and 3070RL

11-29-2010, 12:09 AM
I'd like to buy 1 of these models but would like to know the sizes of the grey water tanks and how they are connected. Looks like there are 2 tanks not just 1.

Terry H
11-29-2010, 12:22 AM
All Big Horns have two 45 Gal. Gray tanks one for the Kitchen and one for the bathroom and washer dryer. One 45 Gal. Black tank. Two Big Horns in the 3800 series have a total of two 45 Gal. Blank Tanks. Specs are here (http://www.heartlandrvs.com/index.php?p=35&c=fifthwheels&sc=BH&view=specs) on Heartland RV's Web site.

11-29-2010, 04:57 PM
The two gray tanks and the black tank only join at the sewer outlet, or just out of sight of it under the belly cover. There is no direct cross-over between tanks, although some folks have done just that by opening both valves and using the sewer discharge plumbing (valved and capped) to do just that. Gray #1 has a smaller discharge line than Gray #2, also, so when you dump it, it will seem to be slow.