Stenner Classic Series Adjustable Injector Pump - 45MHP22

Built on over 50 years of proven performance, the Stenner Classic Series Adjustable Metering Pump delivers precise, reliable chemical injection for a wide range of water treatment and industrial applications. Designed with durability and flexibility in mind, this peristaltic pump ensures consistent output, simple maintenance, and dependable operation—even in demanding environments.

Key Features & Benefits

• Self-priming against maximum working pressure—no foot valve required
• Runs dry without damage and resists clogging from dirt and debris
• Pumps off-gassing solutions without losing prime
• Consistent, repeatable output within ±2%
• Adjustable feed rate from 5% to 100% in 2.5% increments
• Tool-free assembly for easy maintenance and service
• Universal pump head compatible across Stenner models
• Compatible with a wide range of chemical solutions

Engineered for Versatility
Ideal for both water treatment and industrial use, this adjustable pump is commonly used for:

• pH control and adjustment
• Oxidation of iron, hydrogen sulfide, and manganese
• Disinfection and sanitation
• Corrosion and scale prevention

It’s widely used across water conditioning, agriculture, industrial processing, wastewater treatment, cooling towers, irrigation systems, metal finishing, and commercial pool maintenance.

How It Works
All Stenner metering pumps feature a 3-point roller design within the pump head that acts as a built-in check valve, preventing backflow, siphoning, overdosing, and loss of prime. As the motor shaft rotates at a fixed RPM, it drives the adjustable feed rate control, which engages the roller assembly.

The rollers compress the flexible pump tube, capturing and moving the chemical solution forward. As the tube returns to its original shape, it creates a vacuum—allowing the pump to self-prime and deliver a steady, consistent flow regardless of outlet pressure.

Output Control
Pump performance is determined by three key factors:

• Motor speed (RPM)
• Feed rate setting (5%–100%)
• Pump tube size

The pump is constructed with three detachable components—motor, feed rate control, and pump head—making it easy to service or adapt to different applications.

What is a Peristaltic Pump?
A peristaltic (tube) pump uses a rotating roller assembly to compress a flexible tube, creating a vacuum that draws and moves fluid through the system. This design allows for self-priming operation and isolates the chemical within the tubing for cleaner, low-maintenance performance.

Specifications

• Voltage: 120V
• Output: 60 Hz
• Dimensions: 10.6" L x 5.3" W x 6.0" H
• Shipping Weight: 9 lbs
• Max Operating Temperature: 125°F

What’s Included

• (3) 1/4" Connecting Nuts
• (2) 3/8" Ferrules
• Injection Check Valve
• Weighted Strainer
• 20' Roll of 1/4" White Stanoprene Suction/Discharge Tubing
• Spare Pump Tube
• Mounting Bracket
• Installation Manual

Optional Accessories (Available Upon Request)

• 3/8" Connecting Nuts
• 1/4" UV Black Tubing
• 3/8" White Stanoprene or UV Black Tubing