... PS-4 Offer by Poweam Medical Systems Co., Ltd Four function hydraulic bed PS-4 1. Epoxy coated steel bed frame, ... Height adjusting: from 520mm to 810mm, which is operated by hydraulic pump; (3)Trendelenburg, 11°, which is controlled by gear mechanic ... 4. Protecting device in four corners, with IV rod locations5. Four dia-125mm castors, with central locking system; Four function hydraulic bed PS-4