Trying to locate a replacement cartridge but having some trouble w this one, even though it appears to be a pretty standard cartridge. The valve operation is left/right, not in/out or up/down. No screw hole in end of actuator. Water main isn't turning easily so I'm trying to ID cartridge and have a replacement handy before I use brute force to shut the main valve (just in case). Any insight would be helpful, I can't seem to find anything at HD that "looks" the same. Thanks!