Best used as a replacement part for a lost or damaged CSS seat back assembly. Compatible with most Phase 3 Seat systems. Comes with the Spring and Plunger set needed at the seat base. The base of the Phase Lite Seat Back is 4 and 13/16 inches. The nipple is about ½ inch in diameter, protruding about ½ inch. Seat back is 14 "H x 13"W, made of hollow black plastic. The CSS Seat Back Pad and Seat Strap are not included.
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