Thank you for your question. The Delta Victorian Lavatory 3555-MPU-DST model would require RP60400 Stem assemblies to correct leaking under the handle, there are no seats and springs in this model.
However, if your faucet has copper tube coming from the valve body, below the sink, then your actual model would be our older unit 3555-316. If your faucet is leaking water underneath the hot and cold handles, then the RP24096 (brass) or RP25513 (brass with ¼ turn stops) stem units will need to be replaced. If your faucet is just dripping water from the spout when the faucet is not in use, then the RP4993 seats and springs will need to be replaced, under both handles.
Date published: 2019-01-22