Advice please - water tanks and plumbing?

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Originally Posted by mcrover

You can T off a hand pump before the electric pump

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try to use a separate barb on the tank for the hand pump, or the electric pump will suck air through the hand pump;)

Quote:

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Originally Posted by sschmez

try to use a separate barb on the tank for the hand pump, or the electric pump will suck air through the hand pump;)

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You can get one way valves.
I have one to stop the water running back when the tap is turned off.

I use a hand pump on my trailer and it has not let me down in 5 years, plus I can rebuild it if it does break down. Simpler is usually better. :)