I overtightened one of the pressure relief caps and when I tried to loosen it it broke off at the base. They are not very durable. I would recommend putting a pressure relief valve in the PVC piping to avoid this. I used a shutoff valve on each side of the system and a bypass to keep the water on during filter changes. Depressurizing in PVC 3/4 will be much more durable. Overall, for the price, this system couldn't be better (filtering depends on filters). I will buy the exact same system to replace the broken one.
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