Delta Faucet RP31845 Extension Kit Extension nut for RP1000 soap dispenser Adds maximum 1-Inch to deck thickness Rigorously tested to ensure quality performance Thick tile mounting kit for single handle kitchen deck faucets with spray mounted on escutcheon (340, 342, 350 and 380 series) Order one RP30393 and one RP31845 There is no extension kit available for the spray on a model 300 series