Delta MultiChoice Universal Shower Valve Body Rough-In kit. Trim sold separately and includes appropriate cartridge. BX = single box model, HF = high flow, shower-only applications, Also features 1/2 in. universal outlets, inlets/outlets have male threads, Accepts single, dual, or dual thermostatic cartridge, Back-to-back capability. Allows easy fixture changes without behind-the-wall plumbing alterations. Can be tested with air or water without valve using supplied test cap.