Real Plumbing Help Plumbing and Heating Answers

It is not necessary to remove the back plate to replace the Delta Monitor cartridge.
 It is removed in the images because this faucet was just installed.
 If you have this type of  handle you will need a very small Allen key wrench to remove
 the set screw that is in the base of the handle,
 just look for the little hole in  the handle.