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Re: [GMCnet] Portable Macerators [message #320881 is a reply to message #320870] Sun, 23 July 2017 09:07 Go to previous messageGo to previous message
powerjon is currently offline  powerjon   United States
Messages: 2446
Registered: January 2004
Karma:
Senior Member
John et all,
Installed my first macerator in 2001 on our first coach a 77 Eleganza II. Their have been and are several different designs and all work well. The features that I have on the installation that I use is that I have moved both the dump hose and the macerator outlet to the drivers side just in front of the rear bumper. Moving the centered rear outlet gets it out of the way of the tow hitch if you have one and do tow. I also use quick disconnects and a one inch hose which can be extended if you need more length. The switch is located up inside the generator compartment. The drain layout on the Stretch is different and I feel one of the best designs that Buskirk had for the outlet piping.

Pictures on the 77 EL II:

http://www.gmcmhphotos.com/photos/g5371-maserator.html

Pictures on the 78 Buskirk Stretch:

http://www.gmcmhphotos.com/photos/g6973-macerator-ii.html

As for parts:

The 3-in X 1 1/2-in rubber eccentric coupling used in this design is typically stocked at most big box stores and will need to be ordered.You can also get a black PVC version.

http://www.rveparts.com/rv-sewer-holding-tank-offset-reducer-1-1-2/

For the quick disconnect fittings I buy them from Northern Tool & Equipment.

JR Wright
GMC Great Laker MHC
GMC Eastern States Charter Member
GMCGL Tech Editor
GMCMI
78 GMC Buskirk 30’ Stretch
1975 GMC Avion (Under Reconstruction)
Michigan



> On Jul 23, 2017, at 8:03 AM, John Procida wrote:
>
> When I first bought my GMC in 1992 and had to dump a black tank for the first time, I decided that from my boating experiences that I was definitely
> going to install a "marine type" macerator. I grouped together the parts needed and installed a system. NEVER EVER was I sorry and NEVER EVER did I
> have to mess with those nasty expandable waste hoses, gutter supports, donuts, etc.
> My permanent solution includes a standard PVC "T" fitting right after the dump valve which continues the old line plus the "T" goes through a standard
> rubber bushing where the macerator is directly attached. Output of the macerator goes through a permanent heavy duty rubber discharge hose to the
> back bumper where a standard hose bib is attached. I have a special orange "waste hose" (from Amazon) that is used to discharge to the dump site.
> Power is off the rear battery and switched on/off by a hidden waterproof switch in the rear storage compartment. Didn't want to mount the switch
> someplace where someone (kids, curious adults) might flick it just to see what it turned on. I can now dump the entire waste tank faster and cleaner
> than you can hook up the standard waste system. Usually, I don't even hook up to a waste connection at a campground because the permanent macerator
> driven system works so easily.
> The parts are standard parts from RV shop (or Amazon) and Home Depot and only takes a couple of hours to install. The macerator is mounted between
> frame rails to the bottom of the rear floor (using a 2-1/2" wooden spacer) where the floor starts to slope up (between my rear Gaucho seats) and the
> discharge hose and wiring runs along left frame rail. Really simple to install in a couple of hours (honestly) using only a drill, saw and soldering
> gun. I can send a list of parts and photos if you wish. I recommend a permanent installation and keeping some "screw on" hose caps to re-attach after
> discharge. You can probably assemble these parts much cheaper than the listed kit price.
>
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J.R. Wright
GMC GreatLaker
GMC Eastern States
GMCMI
78 30' Buskirk Stretch
75 Avion Under Reconstruction
Michigan

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