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Your shut off valve needs to be before the strainer so you can shut off the water flow and be able to open the strainer and clean it. That is its only purpose for being there.

That would make sense for a strainer unless the strainer was located above the water level like the raw water pump on my boat where I can change it while on the water. Since that action is a...

What is the reason for the valve? The more connectors and valves connected to your fresh water line the higher probability of a failure. The failure of the water line in a static condition (sitting...

Are putting a shut off valve on your water supply to the engine? If so, be sure to add an interlock switch to your engine.