The Whale SDS021T (Gulper 220) is a 24V DC, high performance diaphragm shower drain pump designed to remove wastewater from shower trays when gravity drainage is unavailable. It is widely used in residential wet rooms, marine applications, and RVs. Key features include 12-14 L/min flow rate. self- priming up to 3m, and the ability to run dry without damage. all electric bits and everything you see in pic comes with it. works fine
eBay