The faucet spool is the common size, 53mm long, and the top of the valve core with 20 gears is 7.6mm; This hot cold water valve cartridges are compatible with Kohler two handle faucets from 1990 to 2010; Please make sure your damaged faucet parts is cartridge replacement for K-GP77005-RP & K-GP77006-RP for hot cold faucet before you order. This 1/4'' turn ceramic valve is high temperature resistant, wear resistant and non corrosive; What's more, this faucet cartridge is made from quality brass with chrome plated surface, which makes the faucet valve anti corrosion and can withstand the wear and tear of regular use. Please make sure the water valve is closed before installation; A spanner will help you to remove the faucet handle and the damaged faucet valve cartridge easily; Please check the old cartridge is clockwise close like the replacement one and then install the new replacement for K-GP77005-RP & K-GP77006-RP cartridge and faucet handle back. Our hot cold cartridges are helpful to solve the problem of water leaking from the sink faucet handle head when closed or difficult to open or close kitchen faucet valve; If you have this problem, just choose our ceramic cartridge replacement.