Comet P40 Soft Wash Diaphragm Pump with Gearbox & Regulator – 14.5 GPM, 300 PSI | Summary
The Comet P40 Soft Wash DiaphragmPump (30073-00008.10) is the upgraded, regulator-equipped version of Comet’s popular 3-diaphragm semi-hydraulic pump—purpose-built for high-volume, low-pressure chemical application. Delivering up to 14.5 GPM at 300 PSI, this model includes the GCP 20 regulator, making it a ready-to-mount solution for gas engine soft wash systems using a 3/4" horizontal shaft.
With rugged polypropylene construction, Buna diaphragms, and a factory-installed gearbox, the P40 B GR outperforms older styles (like 6158.0003.00) with improved flow, chemical compatibility, and maintenance access. Whether you’re building a new system or replacing an old P40, this model is the direct upgrade contractors need.
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Factory-Mounted GCP 20 Regulator – Provides precise pressure control for downstream or bypass configurations
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3-Diaphragm Semi-Hydraulic Design – Delivers stable, pulsation-free operation for soft wash chemical spraying
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14.5 GPM at 300 PSI Output – High-volume performance ideal for roof cleaning, siding, and surface treatments
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Self-Priming Pump – Can draw from tanks without assistance, reducing setup time and improving reliability
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Polypropylene Manifolds – Superior chemical resistance against sodium hypochlorite and surfactants
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Buna Diaphragms – Standard chemical compatibility for soft wash mixes
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Gearbox for Gas Engines – Direct-mount to 3/4" shaft engines like Honda GX160/GX200 or CRX 212
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Compact & Serviceable – One-piece molded collector, visible oil cup, and accessible valve assemblies
- Versatile applications: Ideal for soft wash systems, agricultural spraying, lawn care, and pest control, offering reliable performance across multiple industries.
Specification | Details |
Brand | Comet |
Part Number | 30073-00008.10 |
Model | P 40 B GR |
Max GPM | 14.5 GPM |
Max PSI | 300 PSI |
Max HP | 2.3 HP |
Max RPM | 550 RPM |
Weight | 40 lbs |
Oil Capacity | 30.4 fl oz |
Diaphragm Material | Buna |
Construction Material | Polypropylene |
Includes Regulator? | Yes (GCP 20 Regulator) |
Self Priming | Yes |
Inlet | 1" |
Outlet | 3/4" |
Bypass | 1/2" |
Gearbox Shaft | 3/4" Horizontal Shaft |
Mounting | Gas Engine Compatible |