Riva,
Do you guys sell the Groco filters and have you figured out a good place to install them? Thanks

We offer a 3/4" waterline inline strainer. They should be installed in an easy to reach location and, obviously, before the engine.

Riva,
How often do they recommend that the O rings be changed out? Is there a part # for ordering extras? Thanks
Wayne

You shouldn't need to. If you're worried about it drying out apply a little waterproof grease or petroleum jelly to it.

If you've lost or damaged yours check your local hardware store. Ace usually has a good selection of o-rings. Or, you could try a hydraulic supply company.