The Delta Monitor single handle tub and shower replacement parts page please find your Delta Monitor replacement Parts here.
Delta RP46074 This Delta Monitor replacement cartridge works with the Multi Choice Universal Valve body and 13 and 14 series. $74.53
Delta RP19804 This Delta Monitor replacement cartridge works with the 13 and 14 delta Monitor series faucet. $78.50
Delta RP46463 Monitor replacement cartridge for the Delta Monitor 1700 series single handle tub and shower faucets, This is a universal replacement cartridge for the 1700 series and will not work with other Delta Monitor models. $87.12