6 M500-OSY-GPM
Item Number: 0191119Brand - Ames
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- 6 Inch Reduced Pressure Detector Assembly
- Weight: 517.0 lb
- Housing & Sleeve: 304 (Schedule 40) Stainless Steel
- Shutoff Valves: OSY resilient seated gate valves
- Includes gallon per minute meter for leak detection
- Maximum Operating Pressure: 175 psi
- Temperature Range: 33°F - 110°F
- Compact design; 70% lighter than traditional
- Approvals: ASSE 1047, CSA B64.4, UL Classified, FM Approved
Description
Description
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Installation Configurations
- This assembly is available for Horizontal or N Pattern Installations.
Connections
This Maxim M500 backflow preventer features groove fittings that allow for integral pipeline adjustment and easy installation. The OSY gate valves also offer flexibility in connection types (flanged, grooved, or combinations depending on specific model suffix, though "groove fittings" is specifically called out in the product features for this item).

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Additional Details
The Maxim™ 6 inch reduced pressure detector backflow preventer assembly is designed to protect drinking water supplies from dangerous cross-connections, such as those found in fire sprinkler systems, by preventing reverse flow of non-potable substances due to backsiphonage or backpressure.
This assembly monitors for unauthorized water use within the fire protection system and is ideal for health-hazard cross-connections at the service line entrance.
Key Features
- Extremely compact design, up to 70% lighter than traditional designs.
- Constructed with a 304 (Schedule 40) stainless steel housing and sleeve for durability.
- Features a patented Link Check for lowest pressure loss.
- Includes OSY (Outside Stem and Yoke) resilient seated gate valves.
- Furnished with a gallon per minute meter to detect underground leaks and unauthorized water use.
- Groove fittings allow for integral pipeline adjustment and easy installation.
- Designed for unmatched ease of serviceability with a single access cover.
- Utilizes reversible elastomer discs and a corrosive resistant bottom mounted pressure relief valve.
- Available for Horizontal or N Pattern Installations.
WARNING: It is illegal to use this product in any plumbing system providing water for human consumption, such as drinking or dish-washing, in the United States. Before installing, consult your local water authority, building, and plumbing codes.
Specifications
- Size: 6 inch
- Series: Maxim M500
- Housing & Sleeve Material: 304 (Schedule 40) Stainless Steel
- Elastomers: EPDM, Silicone, Buna 'N'
- Link Check Material: Noryl®, Stainless Steel
- Check Disc Material: Reversible Silicone or EPDM
- Test Cock Material: Lead Free* Bronze Body
- Pins & Fastener Material: 300 Series Stainless Steel
- Spring Material: Stainless Steel
- Shutoff Valves: OSY (Outside Stem and Yoke) resilient seated gate valves
- Maximum Working Pressure: 175 psi (12.06 bar)
- Temperature Range: 33°F - 110°F (5°C - 43°C)
- Weight: 407 lbs
Certificates & Approvals
- ASSE 1047
- CSA B64.4
- UL Classified
- FM Approved
- AWWA C511-97
FAQs
What is the primary purpose of this backflow preventer?
What materials are used for the main body components?
Does this assembly include a water meter?
What are the maximum operating pressure and temperature limits?
What certifications does this backflow preventer hold?
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