White colored grease (2 ounce tube) used to form seal between piston and o-ring for these Rainin Multichannel pipettes:EDP1 (EP8, EP12) 10μL, 20μL, 50μL with Snap-On NozzlesAND 200μL, 300μL with older style Snap-Together Nozzles (*Pre-January 2005 pipettes)EDP3 (E8, E12) 10μL, 20μL, 50μL with Snap-On NozzlesAND 200μL, 300μL with older style Snap-Together Nozzles (*Pre-January 2005 pipettes)E4 XLS (E8, E12) 10μL, 20μL, 50μLPipet-Lite (L8, L12) 10μL, 20μL, 50μL with Snap-On NozzlesAND 200μL, 300μL with older style Snap-Together Nozzles (*Pre-January 2005 pipettes)Pipet-Lite XLS (L8, L12) 10μL, 20μL, 50μLFor newer (*Post-January 2005) 200μL and 300μL pipettes, use an o-ring, seal and oil # RA 6100-065 instead of this grease.Also for the following Rainin Single Channel pipettes:EDP2 (E2) 100μL, 250μL, 1000μL, 2500μL