Abstract: A shower or combination shower/tub fixture insert for installation in shower and/or combination shower/tub surround openings, the insert comprising: 1) a concealment panel having a front side and a back side, and including a first aperture therethrough, 2) a shower valve mounted to the back side of the panel and partially extending through the first aperture, the shower valve including a handle, 3) connection means mounted to the shower valve for connection to the available hot water, cold water, and shower head pipes; and 4) an escutcheon plate sized to cover the first aperture of said concealment panel when mounted to said shower valve. The apparatus permits rapid installation of new or replacement tub and shower fixtures through an opening in the shower or combination shower/tub surround without the need for soldering and provides easy access to shower plumbing for future repairs or replacement.