Rohl ZA00045 Extension Only For Volume Control Za33Bo Rough Valve For Ac31 Or Ba31 Trim Sets With Variable Extension Lengths Of 1 5/8" (40Mm) 1" (25Mm) Or 5/8" (15Mm) Can Also Be Used For Ba351 Modern Wall Mounted Lavatory Mixer Faucet Cannot Be Used For Wa30L Or Wa31L These Wa30L And Wa31L Require Za00050