5005/216 Gear Box – 6:1 Ratio for 3/4″ Engine Shaft, Comet Pump Adapter

Upgrade or rebuild your softwash or pressure washer pump drive with the 5005/216 Gear Box, engineered for reliable power reduction and smooth operation. This Comet OEM-quality gear reduction box takes a 3/4″ engine shaft input and delivers a 6:1 reduction—ideal for matching high-Revs of gas engines to optimal diaphragm pump speeds.

Built with double ball bearings, helical cut gears, an O-ring sealed housing, and an air vent cap, this gearbox ensures quiet, durable performance under continuous use. It’s compatible with a range of Comet diaphragm pumps like MP20, MP30, P48, APS41, APS51, and APS71 using Loopax or equivalent mounts.

Key Features

• Gear Ratio: 6:1—reduces engine speed to optimal pump RPM

• Input Shaft: 3/4″ (engine shaft coupling)

• Compatibility: Comet MP20, MP30, P48, APS41, APS51, APS71 pump models

• Construction: Double ball bearing support, quiet helical gears

• Sealing: O-ring sealed housing to prevent contamination

• Cooling: Integrated air vent cap for cooler operation under load

• Mount Style: Direct-mount configuration matching Comet pumps