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2" (Magnum 40) Kit (RP)

The 2" (Magnum 40) Kit is a reduce pressure detector assembly that prevents non-health hazard pollutants and hazardous contaminants from entering a potable water supply system when backpressure and/or backsiphonage conditions occur. This product is designed for irrigation, plumbing, & some waterworks applications. The shut off valves do not include electronic alarm switches.

2" (Magnum 40) Kit Includes:
  • (1) 2½" Magnum 40
  • (2) 2½" Groove Couplings
  • (2) 2" NPT x 2½" Groove Adapter
End connections are union type stainless steel 2" female NPT threads for ease of installation. Entire valve housing is constructed of stainless steel (including shut off valves) for industry leading corrosion resistance.

The smallest, lightest, most economical, best performing, and only all stainless steel backflow preventer. Period.



This Product is NOT UL or FM Approved




Pro Price:

The Magnum 40(x) Reduced Pressure Backflow Prevention Valve prevents non-health hazard pollutants and hazardous contaminants from entering a potable water supply system when backpressure and/or backsiphonage conditions occur. This product is designed for the waterwork, plumbing, and irrigation markets only.
Maximum Working Pressure:
175psi (12.1 bar)
Temperature Range:
33° - 140°F (1° - 60°C)
End Connections
- IPS Groove for Steel Pipe:
- Flange Adapters:
ANSI B16.1 Class 125
Lead Free:
0.25% Maximum by Weight

Flow Performance

Measures & Materials

Valve Housing:
304 Stainless Steel
Valve Cover:
304 Stainless Steel
SOV Disks:
SOV Shafts:
304 Stainless Steel
SOV Bearings:
Non Wetted Bolts:
Grade 8 Zinc Plated
Check Disks:
Wetted Fasteners:
18-8 Stainless Steel
Check Springs:
17-7 Stainless Steel
Check Pins:
17-7/18-8 Stainless Steel
Check Seats:
Noryl Polymer

Engineering & Specifications

The Magnum 40(x) Reduce Pressure (RP) valve shall utilize two independent Dual Action Check modules and two integral resiliently seated shut-off valves all of which shall be contained within a single rigid valve housing constructed entirely of 304 stainless steel. Dual Action Check modules shall operate as a “poppet style” check under low flow conditions, operate as a “swing style” check under high flow conditions and utilize replaceable silicone elastomer sealing discs. Assembly test cocks shall be handle-less and operate via a tamper resistant actuator. Assembly shall have a single full access service port and cover with an “inline” replaceable elastomer seal. Relief Valve shall operate using only static seals (zero dynamic/sliding seals). All wetted surface Relief Valve components shall be constructed of stainless steel. Assembly shall be serviceable without special tools.



True-Seal™ 1stCheck Modules

The True Seal Check Valve was designed to incorporate a poppet only motion during the check stroke and is used exclusively on the first check assembly on the Magnum RP model. This design allows a more consistent pressure loss across the check valve which helps maintain a steady and continual closure of the Relief Valve.

• Light weight engineered polymer components
• Modular for easy removal of complete check from body
• Easily disconnect spring tension for safe check servicing
• Replaceable Silicone Rubber Elastomer Disk
• Excellent resistance to fouling.
Skewed View
Low Flow Poppet Action

Poppet Action


• 100% of check stroke is that of a poopet check
• Consistent static sealing
• Excellent resistant to fouling
• Reliable check closure
• Stable flow characteristics at ALL flow rates

Dual-Action™ 2ndCheck Modules

The Patented Dual-Action Check™ ( US8875733) is the core technology behind the superior performance of Magnum Backflow Prevention Product Line. The Dual-Action Check™ combines all of the best features of industry standard “poppet” checks and “swing” checks into a single high performance check module.

•Light weight engineered polymer components
•Modular for easy removal of complete check from body.
•Easily disconnect spring tension for safe check servicing.
•Replaceable Silicone Rubber Elastomer Disk.
•Excellent resistance to fouling

Skewed View
Low Flow Poppet Action

Poppet Action


•Initial 25% of check stroke is that of a poppet check
•Consistent static sealing
•Excellent resistant to fouling
•Reliable check closure
•Stable flow characteristics at lower flow rates

Swing Action


•Final 75% of check stroke is that of a swing check
•Minimal friction loss at high flow rates
•More linear flow path water through valve

High Swing Action

Bow-Seal™ Full Access Cover

Magnum Bow Seal 1
 Magnum Bow Seal 3

The Patented Bow-Seal™ Full Access Cover ( US8844562) is pre-formed to cylindrical shape friendly to high fluid pressure. This allows the cover to be much thinner and lighter than traditional flat covers while still providing FULL and EASY access to Dual Action™ Check Modules. Additional features include:

• Light weight
• Simple removal
• No sliding seals
• Full access to valve internals
• No cumbersome and heavy couplings

Bow Seal 2
Bow Seal 4

Eccentric-Seal™ Shut Off- Valve

The only large diameter STAINLESS STEEL shutoff valve in the Backflow Industry. The Patented Eccentric-Seal™ Shut Off Valve ( US8887756) has a unique feature in that the inlet shutoff valve sealing disk seals on the downstream side of the valve operation shaft. This allows the #1 test cock to be located adjacent to the valve operation shaft reducing the overall length of the valve (and weight) by at least 2 inches. Additional features and benefits include:

• Self-centering disk seal
• Bolt-on replaceable shutoff disks
• Low torque valve operation
• Disk replacement does not require elastomer compression
• Elimination of seal around valve shaft
• Stainless steel shutoff disk
• The entire valve operation shaft is a single component

Eccentric Seal Shut Off Valve 1

Tamper Resistant Test Cock

The Magnum tamper resistant ½” and ¾” ball valves are the first handle-less test cocks found on large diameter backflow devices in the industry. The top of the valve actuation stem has a unique shape that uses an independent custom wrench to open and close test cocks. All test cocks are lead free and meet the SDWA requirements.

Relief Valve

The Magnum 40 Relief Valve uses a stainless steel body, piston seal and stainless steel sensing line and has been designed to be the smallest and lightest Relief Valve in the industry. Unlike previous relief valve designs, the piston seal does not use the body of the relief valve to align itself properly when closing and opening and instead uses the guide pin on the piston. This will aid in making the Relief Valve resistant to build up and binding. All components of the relief valve are lead free and meet the SDWA requirements.

Relief Valve Image



Specification Sheets

Maintanence Instructions

More Information
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