Fittings for holding tank revision.
Hey all. It's a long story but I'm redoing a mixed black/grey (solo) holding tank on our latest micro-trailer and making it strictly grey and then adding a cartridge toilet instead. The existing...
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If you are draining a sink into the tank you will need 1 1/4" pipe minimum and 1 1/2" would be ideal. Less and you will be waiting a while to drain as you would be creating a funnel. Likewise, the vent line should be the same size as the drain line even if you use an under sink vent stack with a vent valve on it. Shower should be the size of the fitting that is attached to the shower pan/tub for the same reason as the sink.
