2 way valve

[me3_neuralfibre]

I am running my house off my tank whenever possible. I am looking for a ball valve that is 3 way so I can flip between tank and town water easily, without mixing hte two. Saves on hassles with council isolation issues. Current 2 vavle system is less ideal.

I priced some at $100 ea for 1/2" - ouch.

Any tips appreciated.

Thanx
Paul