Watts 2" LF800M4FR

Item Number: 0792021
1 1
$1,772.25
Special Order
When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Watts
  • Size: 2 inch
  • Weight: 16.5 lb
  • Body Material: Lead Free* Copper Silicon Alloy (Bronze)
  • Maximum Operating Pressure: 150 psi
  • Temperature Range: 33°F to 140°F
  • Built-in relief valve for ice formation pressure release
  • Lever handle quarter-turn ball valve shutoffs
  • Replaceable plastic seat for easy maintenance
  • Test cocks for easy testing and winterization

Description

The Watts 2 inch LF800M4FR is a Lead Free* freeze-resistant pressure vacuum breaker backflow preventer designed to prevent backsiphonage of contaminated water into potable water supplies. It features a durable lead-free bronze body and a unique built-in relief valve that helps protect internal components from pressure caused by ice formation. Ideal for continuous pressure applications like irrigation systems, it includes lever handle shutoffs, test cocks for winterization, and a replaceable plastic seat for easy maintenance. It is rated for a maximum working pressure of 150 psi and a temperature range of 33°F to 140°F. Item number 0792021.

Help Me Connect

Installation Guidance

  • The valve is designed for installation in a continuous pressure potable water supply system.
  • It must be installed 12 inches above the highest point of the downstream piping.
  • Install with the supply connected to the bottom and in a vertical position.
  • Ensure adequate space is allowed for periodic inspection, servicing, or testing.
  • The device is equipped with Female NPT inlet and outlet with quarter-turn shutoffs.
  • Test cocks are positioned at the lowest point of the valve for winterization draining.

Note: This vacuum breaker is not designed, tested, or approved to protect against backpressure backflow or water hammer shock. For backpressure backflow protection, install Watts LF009 Reduced Pressure Zone backflow preventer. For water hammer shock, install a Watts Series LF15 Water Hammer Arrestor.

Warranty Information

Limited Warranty:
Watts (the "Company") warrants each product to be free from defects in material and workmanship under normal usage for a period of one year from the date of original shipment. In the event of such defects within the warranty period, the Company will, at its option, replace or recondition the product without charge. THE WARRANTY SET FORTH HEREIN IS GIVEN EXPRESSLY AND IS THE ONLY WARRANTY GIVEN BY THE COMPANY WITH RESPECT TO THE PRODUCT. THE COMPANY MAKES NO OTHER WARRANTIES, EXPRESS OR IMPLIED. THE COMPANY HEREBY SPECIFICALLY DISCLAIMS ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. The remedy described in the first paragraph of this warranty shall constitute the sole and exclusive remedy for breach of warranty, and the Company shall not be responsible for any incidental, special or consequential damages, including without limitation, lost profits or the cost of repairing or replacing other property which is damaged if this product does not work properly, other costs resulting from labor charges, delays, vandalism, negligence, fouling caused by foreign material, damage from adverse water conditions, chemical, or any other circumstances over which the Company has no control. This warranty shall be invalidated by any abuse, misuse, misapplication, improper installation or improper maintenance or alteration of the product Some States do not allow limitations on how long an implied warranty lasts, and some States do not allow the exclusion or limitation of incidental or consequential damages. Therefore the above limitations may not apply to you. This Limited Warranty gives you specific legal rights, and you may have other rights that vary from State to State. You should consult applicable state laws to determine your rights. SO FAR AS IS CONSISTENT WITH APPLICABLE STATE LAW, ANY IMPLIED WARRANTIES THAT MAY NOT BE DISCLAIMED, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE LIMITED IN DURATION TO ONE YEAR FROM THE DATE OF ORIGINAL SHIPMENT.
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Additional Details

The Watts 2 inch LF800M4FR Freeze-Resistant Pressure Vacuum Breaker Backflow Preventer prevents backsiphonage of contaminated water into the potable water supply. This device is commonly used in continuous pressure applications such as lawn irrigation systems and industrial process water systems.

Freeze Protection Features

  • Features a unique built-in relief valve that automatically relieves pressure caused by ice formation within the valve body and internal components.
  • The acetal bonnet acts as a “freeze plug” to help prevent body damage.
  • Includes a freeze sensor connection kit (requires add-on kit, sold separately) to activate a monitoring system for low and freezing temperatures, with Wi-Fi alert capabilities.

A WARNING: The freeze sensor solely provides alerts and cannot prevent a freeze event. User action is required to prevent freeze conditions from causing product and/or property damage. The LF800M4FR is Freeze Resistant, NOT Freeze Proof; adequate drainage/freeze protection must be provided in cold weather applications.

Construction & Design

  • Lead Free* cast copper silicon alloy body (bronze) for durability.
  • Easy maintenance with a replaceable plastic seat, accessible internal parts, and no special tools required for servicing.
  • Silicone seat disc for durability and an O-ring bonnet seal for less possibility of fouling.
  • Test cocks are positioned for easy testing and winterization.
  • Compact, space-saving design with lever handle quarter-turn ball valve shutoffs on both inlet and outlet.

Specifications

General

  • Model: LF800M4FR
  • Size: 2 inch
  • Body Material: Lead Free* Copper Silicon Alloy (Bronze)
  • Construction: Lead Free*
  • Bonnet Material: Celcon®
  • Check Valve Disc Material: Silicone rubber
  • Check Valve Seat Material: Noryl® plastic
  • Vent Disc Material: Silicone rubber
  • Disc Holder Float Material: Polypropylene
  • Springs Material: Stainless steel

Performance

  • Maximum Working Pressure: 150 psi (10.3 bar)
  • Minimum Working Pressure: 15 psi (55 kPa)
  • Temperature Range: 33°F to 140°F (0.5°C to 60°C)

Dimensions & Weight

  • Overall Length (A): 10 5/8 in (270 mm)
  • Overall Height (B): 9 5/8 in (245 mm)
  • Width at Top (C): 3 1/4 in (83 mm)
  • Width at Base (D): 7 in (178 mm)
  • From Centerline to End of Valve (E): 5 in (127 mm)
  • From Centerline to Top of Valve (G): 5 in (127 mm)
  • Weight: 19 lb (8.6 kg)

Certificates & Approvals

  • ANSI
  • IAPMO
  • USC Manual Section 10
  • ASSE 1020
  • NSF Certified to NSF/ANSI 372
  • Approved by the Foundation for Cross-Connection Control and Hydraulic Research at the University of Southern California, Manual Section 10

FAQs

What is the primary function of the Watts LF800M4FR backflow preventer?

Its primary function is to prevent backsiphonage of contaminated water from entering a potable water supply, especially in continuous pressure systems like irrigation.

How does the LF800M4FR provide freeze protection?

It features a unique built-in relief valve that automatically releases pressure caused by ice formation inside the valve. The acetal bonnet also acts as a "freeze plug" to help prevent body damage.

What are the connection types and sizes for this model?

This 2-inch model is equipped with female NPT inlet and outlet connections, each featuring quarter-turn lever handle ball valve shutoffs.

Is the freeze sensor included with the LF800M4FR operational out of the box?

The freeze sensor is included, but an add-on connection kit (sold separately) is required to activate its monitoring capabilities and communication functions, such as Wi-Fi alerts.

What are the maximum operating pressure and temperature ratings for this device?

The Watts LF800M4FR is rated for a maximum working pressure of 150 psi (10.3 bar) and can operate within a temperature range of 33°F to 140°F (0.5°C to 60°C).