Designed to Perfectly Fit AcroPrep™, AcroPrep Advance, and AcroWell™ Filter Plates-Comes complete with the necessary O-ring and gasket. The control block includes the vacuum pressure gauge, vacuum metering valve, vacuum release valve, and 14 in. hose barb for vacuum line attachment.-Vacuum manifold unit includes a Delrins spacer block designed to accommodate standard 350 L receiver plates. The spacer block has been optimized to reduce the space between the receiver plate and the filter plate during vacuum filtration.-Optional spacer block available for use with 1 mL receiver plates.-Adapter collar holds filter plates tightly to receiver plates for centrifugation. This product is not approved for use in medical, clinical, surgical or other patient applications.