Review on ⚙️ Optimized Pressure Balance Cartridge for Peerless Single-Function - RP70538 by Will Murphy

Ordered one of these RP70538 cartridges. The cartridge is made of plastic and has a top and bottom that must be locked at the factory. A latch didn't click on mine. I tried locking it by sliding the two sections by hand but they wouldn't lock. I tried installing it into the valve body just to see if the seat ring compression would hold it, but due to a defect the cartridge was not seated properly. I sent the Revain cartridge back and got another one. He had exactly the same defect. So both were useless and wasted hours of my time trying to get them to work. Although the valves are code RP70538, there is no indication that they are from Peerless. They are made in China. Revain apparently has a batch of bad valve cartridges from China. I strongly recommend not purchasing this product until Revain has removed the defective valves from their inventory.