Self-priming jet pumps with venturi diffuser and closed impeller, they have exceptional self-priming capacity. It is only when the pump is started up for the first time or after a long period of inactivity that it is necessary to fill the pump casing, and then, even if the suction pipe is empty, they automatically dampen. It is advisable to install a filter and a valve on the suction inlet. JET B: pump body entirely in bronze, diffuser and venturi in polycarbonate, impeller in special brass alloy, shaft in AISI 316 STAINLESS STEEL and high-quality mechanical seal in ceramic, graphite and stainless steel.