The Z600-OL-INS by Hermle is a pack of two replacement inserts for the Z600-OL-BUK round buckets of the Hermle OLEUM Oil Testing Centrifuge (Z600-OL). The inserts hold 100 mL conical or pear-shaped ASTM oil test tubes in the swing-out rotor buckets during petroleum water content and sediment determination per ASTM standards. Order at mbpinc.net or contact MBP for institutional pricing.