Ideal for suspended solid test No air pollution, maintenance free Clamp-free spin-lock filter holder Overflow protection IP30 protection RoHS certification CE and CSA certification Other applications: Suspended solid test and vacuum filtration No air pollution, maintenance free Rocker series pumps are piston-driven, no need of lubricant, regular oil changes and maintenance; with no oil pollution. The patented spin-lock design Rocker 300 - LF 30 filter holder can be connected with waste bottle by patented spin-lock connection (M381450) giving a fast and stable installation without clamp. Over flow protection Rocker 300 - LF 30 waste bottle comes with a built-in over flow protection to keep the filtrate from overflowing when waste bottle is full.