These are the ball valves I use, 2 inch and they open and shut easily. I got the ones that have one side that can screw off the lines, so we can pull our pump for the winter, you can get ones that both side are couplings. Picked them up at a plumbing store.
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Hey Addy.... Be careful with those if you are holding any water presure back using the valve AND taking the union joint off. The union joint actually holds the ball valve in place and against the seal...when you remvoe the union the ball inside moves easily away from the seal which means it will leak. I'm currently in the process of doing a pluming job on my new 150 gallon tank and ended up going with the double union valves which seem to be alot better!
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