Positive Displacement Rotary Gear Pump
PA300S 3″ Stainless Steel Rotary Gear Pump
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Overview
The PA300S is a 3″ port positive displacement rotary gear pump with a stainless steel housing and nitrile gears. It handles sensitized explosive bulk emulsion, petroleum products and chemical transfer at up to 158 GPM and 100 PSI, and is fully rebuildable in the field with standard hand tools.
Proven in bulk emulsion operations worldwide. For background on the pumping principle, see what a rotary gear pump is.
Performance — Water @ 280 RPM
SG 1.0 · AmbientHigher-viscosity fluids may require lower RPM. Flow bars are scaled to the 158 GPM maximum. View full engineering data →
Configuration
PA300S
3″ Stainless Steel Rotary Gear Pump
Materials of Construction
Connections, Weights & Shipping
Nitrile gears are standard; Viton® gears available for aggressive chemical service. Full dimensional detail is called out on the drawings below.
Seal & Gasket Part Numbers
Reference Drawings
Inches · Not for fabricationDrive shaft may be fitted in either position.
Traced from NAPCO factory drawing · Rev. 07/2026
Rebuild, Don’t Replace
PK300S — 3″ Stainless Steel Repair Kit
Drive and idler gear assemblies, all high- and low-pressure seals, all bearings, and a full gasket set — everything needed to restore the pump to original factory specification.