Quote:
Originally Posted by sonbar
Thank you for your help. 30gals sure seems small
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In nearly every RV, the holding tanks have to be "small" so they can fit between the frame rails and the cross members. Typically they are about 60" long, 20" wide and 5" deep sloping to around 8" on the drain valve end. That size tank will hold about 30-35 gallons. They have to be located so the sinks and shower can "drain properly" into the tanks. There's no way to run a drain line with the proper slope (not to mention compensate for a trailer that may sit "un-level on the site" if the drain line has to run from the rear to the front of the trailer. That 2" drain line slope is reduced to zero if the rear of the trailer is 2" below "perfect level"...
So, as a "general rule" in Keystone trailers, if the gray tank capacity is greater than 45 or 50 gallons, you can almost guarantee that there are two gray tanks under the floor.
In your floorplan, the galley sink sits "approximately" over the center of the axles. I'd guess that your galley gray tank drain valve handle is mounted on the frame rail, between the wheels (under the slide) or just forward/aft of t he wheels. On my Cougar, the galley is in the rear of the trailer and the gray tank is "forward of the fresh water tank" which is located at the extreme rear of the frame rails with the galley tank in the next "crossmember space". The drain valve handle is located "through the coroplast belly liner" and not "on the frame rail". The reason for this is the proximity of the slide rams in that area.
On my trailer, and on most Keystone trailers that I've seen, there is a "very small, almost blended into the trailer sidewall, decal that says, "GRAY TANK". The decals are located just above the J-wrap molding on the trailer sidewall and directly over the drain valve handle.
Take a look at your trailer sidewall and see if you have these decals to help locate the valve position...