Plastic Rotary Pumps Rely on the quality construction, superior chemical resistance and effortless operation of these rotary pumps. Choose the polypropylene model for water-based solutions of acids, alkalis and salts. For more agressive chemicals including chlorinated solvents, aromatic and aliphatic hydrocarbons, the ryton pump is recommended. Model RP 90RT has a teflon vane, seal and flange gaskets. All pumps siphon at a rate of six gallons per minute and come complete with a strainer and 2" polyethylene bung adapter.