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RP46463 cartridge has a GREY cap and is for Monitor 17 dual-function shower faucets made after 2006
NOT for single-function Monitor 13/14 series faucet
The screw on the old adapter design is not necessary. It could cause leakage and affect the smoothness
If your shower was made before 2006, the right part should be RP32104(WHITE Cap)
RP46073 Seat and Spring Adapter included
RP46463 Cartridge Replacement For Delta Monitor 17 Series 2006-Present Shower Faucet RP46073 Seat and Spring Adapter included B07G2TCSKF