Hercules Duck Butter is a soft-paste, water-soluble pipe lubricant for joining pipe and fitting rubber, synthetic rubber, or plastic gaskets. Duck butter can also be used on PW, DWB, and sewer systems. The paste is clean, odorless, non-staining, non-toxic, adheres to wet and dry surfaces, spreads easily and thinly, providing superior lubrication, dissolves in hot water, and doesn't leave a residue after assembly and flushing.
Oatey
