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That's good advice. For the do-it-your-self-er this could be hazardous. When I use this method to clean the barrel of the valve it's always done if it's an extreme case of scaling. I always turn on the water supply slightly and run copious amounts of water through the valve. Santeen will...

Your right, my apologies, Sometimes they will provided a small tube of silicone grease with the cartridge. The grease I use is silicone based, I should have provided that info, again sorry M

Looks like this job needs to start under the floor and work it up to be right. Not there to look at different options though Definitely more units than can be handled with what's existing

Inspect the inside of the valve before putting the new cartridge back in. If it' scaled or pitted really bad it will damage the o-rings on your new cartridge. I use a product called Santeen. Get mine at ACE but it's available probably at other locations. WEAR safety glasses and gloves when...

Did you ever get this issue answered? Curious since I've never hear of a PUI. Been plumbing for over 25 years. I can see in the pics there is an additional fitting connected to the pvc that isn't normally there. IF these are check valves, the UPC (uniform plumbing code) requires there to be...