There is a Y valve (see photo below) between the toilet outlet and the Lavac pump on Kinora, the second inlet hose (black) runs down to a sump in the floor outside the head. I assume the original intent was to provide a way to pump water out of the forward area of the boat using the Lavac toilet pump but the Y valve is frozen in the toilet flush position. An internet search suggests it is a Bosworth Sea-lect Y valve.
Does anyone know if there is an Australian, preferably Sydney, supplier for these valves?

Thanks in advance.
Kinora