Check your SMB fresh water valves

[1der]

Installed new tanks and PEX over the weekend in a friend's SMB RB50 E Series van. Got it all buttoned up and switched the water pump on. The water pump was burping which meant a leak some place. Traced it to the valve body from one of the original SMB valves used to manage the City water supply / tank fill lines. May have been caused by freezing but looked more like a failure.



We increased capacity from a single 10 gal to 25 gal (25 + 10) two tank solution with the ability to shut off the 10 gal tank if not needed. Added 3" O ring fill/clean-outs, water supply shut off to water pump , and very low water tank pickup for the water pump. The tanks extend about three inches beyond the couch frame but it was worth it. In a complete new build and locating the water pump, drains, etc. differently, the water tanks would have fit under the couch.

 

[1der]

Correction - Added a 15G Primary + 10G secondary tank for a total of 25G

 

[Stormy98]

Looks great. I have a slow (once a minute or so) pump activation I need to trace. I'll take an extra close look at the valves.

Those 3" fill/clean-outs look really convenient. What product is that? Tried a bunch of searches but couldn't locate anything similar.

 

[1der]

Re: 3" ports - I order them with the tanks with all the fittings spun welded at the same time.