Zoeller Shark Series® 3/4 HP M805 Residential Grinder Pump

Tackle tough residential sewage applications with a compact grinder that’s built to last. Shark Series® 3/4 HP M805 automatic Grinder Pump (805-0016) uses Tri-Slice® cutter technology and a durable cast iron housing to grind and move waste where standard ejectors struggle. Its 3/4 HP, oil-filled motor delivers dependable performance up to a 45 ft shut-off head, and the automatic float switch simplifies set-and-forget operation. Plus, this unit includes a 25-foot power cord for deeper pits and flexible installs.

Key Features

Save Service Calls With Proven Grinding

Equipped with Zoeller's Tri-Slice® dual-blade cutter system, designed to break down tough household waste before it's pumped through the discharge line. The angled cutting blades help reduce the risk of clogs, making the system more reliable for everyday residential wastewater applications.

Everyday Performance You Can Rely On

Built with a 3/4 HP oil-filled motor and durable cast iron construction, the pump delivers the power needed to move wastewater efficiently through long discharge runs and higher lift applications. Whether installed in a basement bathroom or a residential sewage basin, it provides dependable performance when it's needed most.

Installer-Friendly Automatic Control

An integrated vertical float switch automatically starts and stops the pump based on water level, eliminating the need for manual operation in simplex systems. This self-contained design simplifies installation while providing reliable, hands-free performance for homeowners.

Simple, Standard Hookups

Designed with a 1-1/4" NPT vertical discharge and standard 115V single-phase power, the pump integrates easily into many residential grinder pump systems. Its familiar connection points help streamline installation while maintaining compatibility with common plumbing configurations.

Our Expert Review: Zoeller 805-0016 Shark Grinder M805 Automatic Cast Iron Residential Grinder Pump

Summary

If you're looking for a grinder pump that doesn't flinch when things get ugly, the Zoeller Shark Series® 3/4 HP M805 automatic Grinder Pump is built for exactly that. This 3/4 HP automatic cast iron grinder pump has earned its reputation in real-world residential sewage systems thanks to its dependable performance and rugged construction. It isn't flashy, and it isn't built to impress on paper. It's a blue-collar workhorse that's designed to show up, do its job, and keep working.

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Performance: 5/5

The M805 delivers the kind of power you'd expect from a professional-grade grinder pump. Its 3/4 HP motor, 3,400 RPM operation, and 55-foot maximum head provide the performance needed for demanding residential sewage applications. The combination of Zoeller's Tri-Slice® cutter technology and vortex impeller helps reduce solids before they enter the discharge line, making it well suited for basement bathrooms, pressure sewer systems, and installations where reliable grinding performance is essential.

User Experience: 4/5

At around 65 pounds, this is a substantial cast iron pump that's meant to be installed once and left to do its job. The integrated automatic float switch keeps operation simple by eliminating the need for external controls, while the overall design makes installation straightforward for professionals. Once it's properly installed in a correctly sized basin, it cycles consistently and operates with the dependable performance Zoeller is known for.

Quality: 5/5 

This is where the M805 really stands out. The cast iron housing, stainless steel cutter, carbon and ceramic seals, and automatic thermal overload protection all point to a pump that's built for the long haul. It doesn't feel like a lightweight residential pump. It feels like equipment designed to handle years of demanding service. When installed and maintained properly, it's easy to see why contractors continue to trust Zoeller for grinder pump applications.

Value: 4/5

The M805 isn't the least expensive grinder pump available, but you're paying for proven engineering, heavy-duty materials, and a design that's been field-tested for years. Between its grinding performance, durable construction, and dependable automatic operation, it offers strong long-term value by helping reduce maintenance, minimize callbacks, and provide years of reliable service.

Final Verdict

If you want a grinder pump that clocks in, chews hard, and doesn't complain, the Zoeller Shark Series® 3/4 HP Model M805 automatic Grinder Pump is an excellent choice. It's well suited for basement bathrooms, sewage ejector replacements, and residential pressure sewer applications where dependable grinding performance matters. Blue collar. Cast iron. Built to work.

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Product Details

• Oil-filled motor and cast iron motor housing
• Automatic pump with a preset, built-in snap action switch
• Tri-Slice® cutter technology: Three independent cutting channels for 250,000+ cuts per minute
• Stainless steel float guard
• Solid, buoyant, polypropylene float
• Powder-coated epoxy finish
• 100% Factory Tested
• Stainless steel screws, switch arm, guard, handle and hardware
• 3-Year Limited Warranty

Since 1939, Zoeller has set the standard for dependable pump technology, engineering high-quality water and wastewater solutions for long-lasting performance.

Additional Details

• Brand: Zoeller
• MPN: 805-0016
• Series: Shark® M805, automatic
• Type: Submersible residential grinder pump with vertical float switch
• Size/Capacity: 3/4 HP (0.75 HP); max flow ~40 GPM; shut-off head 45 ft
• Material/Finish: Cast iron motor housing, pump housing & base; stainless steel hardware
• Performance: Tri-Slice® grinder; 3400 RPM; full-load current ~9 A; max liquid temp 130 °F
• Connections/Fit: 1-1/4″ NPT vertical discharge; 115 V, 1-phase; grounded plug
• Dimensions: Approx. 13″ L × 8-29/32″ W × 17-1/4″ H (pump body)

Zoeller M805 Grinder Pump FAQ

What is the Zoeller M805 Shark Grinder Pump used for?

The M805 is designed for residential sewage applications where wastewater needs to be pumped through smaller discharge lines, longer runs, or higher lift conditions. Its integrated grinder system breaks down solids before pumping, making it a reliable choice for basement bathrooms, sewage ejector replacements, and residential pressure sewer applications.

What is the difference between a grinder pump and a standard sewage ejector pump?

A grinder pump is designed to cut wastewater solids into smaller particles before they are moved through the discharge line. This allows for smaller piping and helps handle more challenging sewage applications where a traditional sewage ejector pump may not provide the same level of grinding capability.

How does Zoeller's Tri-Slice® cutter system work?

The Tri-Slice® cutter system uses a rotating cutter and stationary cutter plate to break down solids before they enter the pump housing. This grinding action helps reduce the size of waste materials, improving flow through the discharge system and helping reduce the risk of blockages.

How does the automatic float switch work on the Zoeller M805?

The 805-0016 uses an integrated vertical float switch to automatically turn the pump on and off as the water level changes inside the basin. This built-in control eliminates the need for a separate switch in simplex installations, helping simplify setup while providing dependable automatic operation. The solid polypropylene float is designed to remain buoyant and functional without becoming waterlogged over time.

Does the Zoeller M805 come ready for installation?

The M805 includes the automatic pump assembly, integrated vertical float switch, and a 25-foot power cord for added installation flexibility. Before installation, the pump should be matched to the correct basin size, discharge setup, and electrical requirements for the specific application to ensure proper operation. If you're unsure about your setup

Weight	65.0 lb
Height	14.00 in.
Horse Power	1/3
Length	9.75 in.
Room	Utility
Voltage	115V
Width	7.50 in.
Inventory Number	ZOE805-0016
MPN	805-0016

• Spec Sheet
• Installation Manual
• Owner's Manual
• Pump Performance
• Replacement Parts