Installed the main drain. there is a rubber coupling to the tank, then a sanitary tee is mounted in reverse with the leg facing towards the front of the coach with a 45 then an offset reducer I made with an end cap and a 2" cleanout adapter. I plastic welded this part. The Macerator will mount here, then a perforated skid plate will mount below to protect all. the slide valve is mounted aft of everything, this gives me about 2 gal of extra storage in the waste pipe. the output is then 90'd to the left side of the coach behind the Genset door.
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