T & S Brass Cold Cerama Cartridge With Bonnet & Spring

CARTRIDGE MARKINGS Eterna Bonnet means with packing nut. Escutcheon bonnet means with packing and escutcheon nuts. Cerama bonnet means no packing or escutcheon nut. If you are retrofitting an existing Eterna cartridge, you may choose the Cerama with no bonnet and use the existing Eterna bonnet already on the faucet. Hot Ceramic cartridges will be marked RTC (Right-To-Close). Cold ceramic cartridges will be marked LTC (Left-To-Close)