"Designed with the user in mind, the swing bolt and hinged lid or Davit arm assembly enables cartridge changeout to be achieved with no loose parts, heavy lifting or tools required. Manufactured with lids weighing up to 60 kg, these heavy-duty housings ensure all health and safety angles are covered by this Premier housing feature, whilst also providing reduced labour operation for engineers carrying out cartridge changeouts. Extensive stock holding, along with complete technical back up, ensures confidence in finding the correct housing for each application. All housings come complete with a universal plate which is capable of accepting both DOE and 222 fittings. The 21 round housing utilises a swing bolt and Davit arm assembly to safely and effortlessly move the housing lid to one side, eliminating the need for heavy lifting and significantly reducing downtime during changeout. Providing effective filtration equivalent to 84 10"" cartridges, this housing is supplied with 4"" DN100 inlet and outlet connections, drain ports for complete emptying of the housing during changeout and pressure gauges to provide accurate differential pressure readings for filter monitoring. "