These 1-1/2" inlet and outlet ports are used in Jabsco's electric Diaphragm Waste Discharge Pump (59090 Series), and in their Amazon Universal Manual Bilge Pump (29270 Series).
"WARNING: California Proposition 65 This product can expose you to chemicals including Nickel (Metallic), which is known to the State of California to cause cancer. For more information go to www.P140Warnings.ca.gov."
www.P65Warnings.ca.gov