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I have a Savko union ball valve on my drain line as well. My tank is a converted Tenecor Simplicity Plus system, (essentially the back 4" of the tank was a wet/dry system and is now a giant overflow with approximately 14 gallons of water). I installed the valve since I have a small sump, (18 gallon converted amiracle wet dry), in the stand and I can shut the drain valve, shut the return valve and pull the sump, skimmer etc out for work/cleaning/repair etc. I didn't think it was a bad idea and have used this valve already. Also if I have to pull the durso pipe out I didn't want to overflow my sump with that additional 14 gallons. I can understand your thinking if you have the normal in tank overflow which probably only holds a few gallons of water or if you were using a decent sized sump. Just my situation.
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