This is a White Rigid End Cap for Wall and Ceiling Panels. They are used to finish off the edge of the wall panels without using batten strips or seam tape. Comes in 8 Foot Sticks and is 3/16". They have been used on RV's and Motorhomes such as Fleetwood, Winnebago, Forest River, Thor, Skyline, Monaco etc.

PHOTO: shows Clarsbad paneling with P94 White Rigid End Cap