Duda Energy ExpTank-050VL-S 50 Liter (13.2 Gallon) Red Expansion Tank for Solar Water Heater Systems - Thermal Pressure Protection - Perfect for Residential & Commercial Solar Water Heating Applications

I used this tank with my existing 4 stage reverse osmosis filter system.The bladder in the original tank failed after more than 10 years of service.This has double the volume of the original which means that we can still make tasty coffee after boiling a big pot of pasta and having a glass of water with our meal. No more waiting for the tank to refill!Found the fittings needed to adapt 3/4" connection to original tubing (1/4" if i remember correctly) at the local hardware storeand after removing the plastic valve cover the tank now sits on the plastic "socket" that came with the original tank.I let the tank fill up and drain fully twice before using the water to remove any possible contaminants.Overall i am very happy with the upgrade and the price (important) was the best I could find anywhere!Note: The tank comes pre-pressurized at about 30 PSI. That will NOT work for this application!With a reverse osmosis filter system the pressure BEFORE installation should be 5-7 PSI.Wish I checked that earlier but I am a man, a standard tire pressure gauge worked fine to get it right.