We purchased our shower parts from Home Depot in Phoenix, Arizona in the summer of 2014. Just recently when we turn the single shower handle to get colder water to balance out the hot water, the shower seizes up and stops the flow. The part number that is on the outside of the cartridge is HL-40. Home Depot doesn't have the part in-store and we can't find it on their website nor on the Internet. Can anyone help?
