Standard Pack = 1 piece(s). Simple to install and operate, this self-contained station features a nozzle strap that easily removes to activate flushing, leaving hands free to hold eyelids open. Large 16 Gallon capacity permits thorough flushing by providing 0.4 gpm over the entire 15-minute flushing period, required by ANSI Z358.1. Model Number: 320002300000, 320005130000, 320011000000