Filters blow molded in one piece without union or welding. Manufactured in plastic resin unalterable by chemical and atmospheric agents. Easy lid opening. Fitted with a pressure gauge, manual air and water purges and a multi-way valve. Ivory color. Maximum pressure of 2.5 kg/cm2 for Ø 430 mm and Ø 480 mm filters, and 2 kg/cm2 for Ø 560 mm and Ø 660 mm filters. 1½" valve