I'm using a Flojet macerator pump and have a 30-gallon recycled plastic barrel mounted in the truck bed.
The Flojet hose is 3/4" pond fountain hose, it was the lightest 3/4" hose I could find. 5/8" garden hose would work almost as well.
The top bung on the barrel has a 3/4" elbow screwed in and capped with a plastic pipe plug, this is the vent.
The lower bung has a 2" to 1-1/2" bushing, and the valve is an 1-1/2" Valterra-style (gray water valve).
On the inlet side of the valve I have a 1-1/2" Banjo QD fitting.
The discharge hose is 1-1/2" sump bump hose with a mating Banjo fitting on it.
For filling the barrel I have another mating Banjo fitting with a 3/4" garden hose fitting for the hose coming from the Flojet pump.
I originally had a 3/4" discharge hose and 3/4" ball valve but it was slow draining.
So - the barrel is filled though a 3/4" hose via the Flojet and emptied with the 1-1/2" sump pump hose.
Sorry, no pics.