Wanted to pick up a hull sea cock for the head today
Wondered what size for the outlet to use?
Bloody phones
TCM macerator

According to Google, its a 1 inch outlet from the TMC macerator pump.

www.chsmith.com.au/Products/TMC-Remote-Macerator-Pumps.html

TMC Remote Macerator Pumps

Suitable for emptying marine and RV holding tanks, this pump macerates and discharges grey water and waste mixtures.
Optional repair kit suits both models.
Self priming up to 1.5 metres.
Flexible impeller pumptype.
Dual-cut MetalBlade grinds waste.
Port Size: Inlet: 1-1/2". Outlet 1".
Delivery head 5m (16ft).

Have the same one on my boat and 1" outlet.