APEC Water Systems Auto Shut Off Valve Replacement Part (ASO)

Fixed my RO system. Easy repair if you always water running this may be your issue.

I used this to replace the ASO on our Watts Ro-pure system. It works as a direct replacement. I do notice that the system pressure is better now and the endless wastewater drainage has stopped. Hooray.

Exactly what I needed, works good.

Great product. It fixed the trickling problem I was having with my existing RO system. My existing system is a Watts RO water filter system. My two-year-old Watts RO unit never stopped trickling water into my sink drain. It just kept running and running and the sound was annoying, not to mention that it was wasting water. So I first changed the filters (not the membrane), but that didn't fix the issue. So I decided to change the auto shut off valve before spending a lot more money on the RO membrane. Lucky for me, the shut off valve fixed the issue. The water now stops trickling only a couple minutes after I fill a glass. However....this valve didn't fix my capacity issue. When my RO unit was new I could fill a 1.5 liter bottle in one shot, then it got to the point where I could barely fill an 8oz glass before the water ran out. I fixed the capacity issue by adding a little air pressure to my RO tank using a bike pump.

I can confirm this ASO valve is a suitable replacement for 1/4" tubing ASO valve used in the Watts 4 stage RO filtration system. After installing the replacement I learned some tips for those who wanted to save a little money by using a "non-standard" or "off brand" replacement part for ANY RO system. 1. Ensure correct tubing size. Make sure you know the correct tubing size for the feed lines in your RO system. This product is compatible with 1/4" tubing only. 2. Install ASO Valve correctly. If you, like me, are installing this ASO valve as a replacement in a NON APEC RO system, the color coding with the ports may not match. The blue collet on the "in" side of the ASO valve connects to your COLD WATER SUPPLY. The white port connects to your RO Tank. From there it's simple to connect the "out" side keeping the tube color pattern consistent. 3. Check ASO Valve function. After you have turned the water supply back on, you will probably hear the system functioning and also that draining sound which may have started you down this path to begin with. TAKE HEART! Here's what you do: SHUT OFF THE TANK VALVE AND WAIT 5-10 MINS! If the ASO valve is installed correctly and there are no other problems with your system, the ASO valve should engage once the correct pressure is reached in the system and the water will stop draining. REMEMBER, THE SYSTEM WILL NEED TO PRESSURIZE BEFORE THE ASO VALVE WILL FUNCTION! THIS CAN TAKE 5-10 MINUTES. IF, AFTER 5-10 MINS, THE WATER CONTINUES TO DRAIN, THE VALVE MAY BE FAULTY OR THERE IS ANOTHER REASON YOUR RO SYSTEM IS NOT REACHING ADEQUATE PRESSURE! The main take away is, once you install the ASO valve, the system will need to re-pressurize before it will stop draining and that can take 5-10 mins. Do not expect the water to stop draining immediately. Also, if your RO tank has inadequate pressure it may need to be re-pressurized. When the tank is full of water, it should read at least 40 psi. Hope this helps!