I installed a Macerator in my scamp
with an * gallon black tank and the 26 gallon gray,
Here is a picture of the macerator under the drivers side floor front.
I took the pump apart and turned the outlet where it would go through the floor and through the cabinet to the reel in the next compartment.
Here is the powered reel for the discharge hose 1" There is a ball valve on the end and an elbow to make it sit in the dump port.
There is about 20 feet of hose on the reel and the electric motor winds it back up.
The white and blue hose is the drain line from the shower drain pump on the curb side under the floor.
Above is the dump valve and the valve to the macerator pump from the front feed. The rear has a similar tap and valve.
I made the 2" tap by cutting into the 3" line with a hole saw and gluing and building it up with ABS cement and ground up ABS