RWP which direction?

I have a RH rotation 340 that originally had a Jabsco raw water pump. I found a crack in the housing so a Sherwood G7B took its place. Since it was never installed on this boat and their are no markings for inlet/outlet which way is right? Some say it is bi-directional and orientation doesn't matter. Anyone on this trusted site care to shed some light?

There is no in and out on a rubber impeller pump since they will work in ether rotation. Maybe this vid will help you to understand how they work

That was a cool video! I will take a closer look with housing off to try and make more since of it. I hooked water from garden hose to the fake-a-lake and wasn't getting it to prime. I was afraid to rev up and decided to investigate further before i burned up a new impeller. Thanks for the replies. PS- Baitkiller, what the hell is a Dorf?

Dorf? Tim Conway? Now you guys have really lost me.

The Raw Water Pump is bi-directional, only in the sense that it can be made to work on either a RH or LH rotation engine. But, you just have to make sure it's facing the right way for your engine.

If it's not taking a prime, even with the positive pressure put on the system by the fake-a-lake, it's a safe bet it needs to be turned around so the can screw is facing the other way.

When you've gotten past the initial prime, your really want to test it with the bucket method, so it's sucking on its own. The fake a lake might be pushing water for it, so it's not a great test if everything is working as it should.