The BADU 21-50/ 42 G is a non-self priming circulation pump that is highly suitable for huge whirlpools, hotel pools, pool and industrial filtration units, counter-swim units, massage stations, air-conditioning units, cleaning units different applications that requires a flow rate up to 54 meters. This pump is constructed with a bellows-type of mechanical seal that is mounted on a plastic-shaft protector sleeve. Its discharge outlet swivels progressively and the threaded inlet and outlet connections are suitable for union. Furthermore, the 21-50 / 42 G must be installed below the water level with electrical separation.