Adding automatic bilge pump to manual bilge pump
Ok, I have a manual pump that is operated from the cockpit. I would like to add a second automatic pump in the bilge. I think I understand the wiring end. However, do I need to run a second pump hose out of the boat, or can I rig a Y valve on the stern side of the manual pump, and shut off the manual side when it is not needed? Also, should I add a check valve in the hose, close to the pump?
1977 C&C 27 MKIII