Stenner 85M5 3/8" Single Head Feeder Pump 120V 3/8" White Tubing | 85MJL5A3STAA

Stenner 85MJL5A3STAA Classic Series Single Head Adjustable Peristaltic Metering Pump – 85 GPD, 25 PSI, 120V (3/8" Tube)

The Stenner 85MJL5A3STAA is a Classic Series single head adjustable-output peristaltic metering pump designed for dependable chemical feed in commercial pools, water treatment, and industrial applications. Output is adjusted with an external dial to fine-tune dosing, while the peristaltic design stays self-priming and handles many off-gassing solutions without losing prime.

Key Features

• Series/Type: Classic Series 85MJ, single head adjustable-output peristaltic pump
• Adjustable feed control: External dial provides an adjustable range from approximately 5% to 100% output in 2.5% increments (20:1 turndown)
• QuickPro® pump head: Tool-free access and fast pump tube replacement
• Peristaltic dosing: Self-priming, consistent metering, and tolerant of many off-gassing chemical solutions
• Service-friendly design: Motor, feed rate control, and pump head separate without tools for easier maintenance

Performance & Specifications

• Max output (at 25 PSI): Up to 85 gallons per day
• Approx. adjustable range (at 25 PSI): 4.3 to 85 GPD
• Max working pressure: 25 PSI
• Max suction lift: 25 ft vertical lift (water)
• Voltage/Frequency: 120V, 60 Hz, single phase
• Max operating temperature: 125°F
• Max viscosity: Up to 1500 cP
• Pump tube (this model): Tube #5 (3/8" OD white) with Santoprene® tube material
• Motor: 1/30 HP, continuous duty
• Power cord: 6 ft cord with standard 120V plug
• Shipping weight (approx.): 9 lbs

Common Applications

• Pool and spa chemical feed (sanitizer, pH control)
• Water conditioning (oxidation, disinfection, scale/corrosion control)
• Industrial process dosing and cooling tower treatment

Related Products

• Search: Stenner 85MJL5A3STAA (check if this exact pump is listed in our catalog)
• Search: Stenner Pump Tube #5 (3/8" Santoprene) (primary wear item that controls output on this model)
• Search: Stenner QuickPro Pump Head Service Kit (roller/parts kits for QuickPro heads, depending on inventory)
• Search: Stenner Injection Check Valve (a restricted injection point can stop flow even if the pump runs)
• Search: Stenner Suction Strainer / Foot Valve (helps prevent debris from entering the suction line and pump head)
• Search: Stenner Rain Roof (MP90000) (recommended for outdoor installations)
• Shop: Stenner (browse more Stenner pumps, parts, and accessories)

Installation & Maintenance Tips

• Calibrate output in the field after installation—actual feed can vary based on chemical properties, suction lift, and system pressure.
• Replace the pump tube on a regular schedule; a worn tube is the most common cause of low output, loss of prime, and inconsistent dosing.
• If the pump runs but flow is low, inspect the injection check valve and the injection point for scale or blockage.
• Keep suction connections airtight—small air leaks on the suction side can cause intermittent output and priming issues.
• For outdoor installs, protect the unit from direct weather exposure (use a compatible rain roof/cover where applicable).
• After servicing, run the pump and visually confirm steady discharge flow, then re-check for drips or air intrusion at fittings.