PipetteSupplies.com stocks both Teflon and Polyethylene piston seals. Polyethylene Pipetman seals are the most popular option and are injection molded. Teflon Pipetman seals are machine molded. Polyethylene seals have tighter tolerances; Teflon seals are more pliable, and tighter. Both seals are autoclavable once and have about the same durability.
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