Guenther Supply Inc. is a stocking distributor of Watts Backflow Prevention Products. These products are designed to prevent the reverse flow of contaminated water from entering into the potable water supply due to back-siphonage and or backpressure. We have an extensive inventory of reduced pressure zone assemblies, vacuum breakers, repair kits, and accessories. For more information about the Watts Backflow Prevention Product line, please see below or contact us directly.

LF909 Lead Free Reduced Pressure Zone Assembly

  • Prevents the reverse flow of polluted water from entering into the potable water supply due to back-siphonage or backpressure where there is a potential health hazard.
  • Relief valve design provides substantially improved relief valve discharge performance during emergency conditions of combined back-siphonage and backpressure.
  • Small diameter assemblies (1/2 – 2) have a compact modular design that facilitates easy maintenance for in-line repairs.
  • Can be installed horizontally or vertically without the need of any special tools.
  • Lead free construction.
  • No special tools required for servicing.
  • Maximum Working Pressure: 175psi
  • 3/4”, 1”, 2” inventoried at Guenther Supply Inc

LF919 Lead Free Reduced Pressure Zone Assembly

  • Prevents the reverse flow of contaminated water from entering into the potable water supply due to back-siphonage and or backpressure.
  • Lead Free* cast copper silicon alloy body construction, two poppet style check valves and replaceable check seats, with an intermediate relief valve.
  • Compact modular design facilitates easy maintenance and assembly access.
  • Ideal for protection at health hazard cross-connections or for containment at the service line entrance.
  • Separate access covers for the check valves and relief valve for easier maintenance.
  • Bottom-mounted relief valve reduces installation clearances.
  • Top-mounted test cocks reduce installation clearances and make testing easier.
  • Innovative plastic seat guides and check valve plastic cover bushing for trouble-free guiding.
  • Maximum Working Pressure: 175psi
  • 1/2”, 3/4”, 1”, 1-1/2”, 2” inventoried at Guenther Supply Inc

957 Lead Free Reduced Pressure Zone Assembly

  • Prevents the reverse flow of liquids in a plumbing system due to backpressure or back-siphonage where there is a potential health hazard.
  • Compact design and lightweight stainless steel construction (70% lighter than traditional designs) makes installation easier and faster.
  • Groove connections also ease installation and pipe alignment.
  • A variety of shutoff valve options are available.
  • Series 957 is also available with SentryPlus™ Alert technology to detect catastrophic relief valve discharge that could potentially cause flooding, and issue a multi-channel alert (call, email, text) to selected users so they can take action to avoid potentially costly flooding.
  • Bottom-mounted cast stainless steel relief valve. Replaceable check disc rubber.
  • Patented torsion spring checks provide lowest pressure loss.
  • 3” inventoried at Guenther Supply Inc

9D Backflow Preventer

  • Series 9D Dual Check Valves with Intermediate Atmospheric Vent prevent the reverse flow of hot or cold polluted water from entering into the potable water supply.
  • Brass body with stainless steel internal parts, integral strainer, and two durable, tight-sealing, rubber check valves.
  • Designed for continuous pressure, non-health hazard applications in smaller supply lines, such as laboratory equipment, processing tanks, sterilizers, dairy equipment, and specifically for boiler feed lines.
  • Minimum Working Pressure: 25psi (172kPa), Maximum Working Pressure: 175psi (12.1 bar).
  • Primary check valve has rubber disc seating against a mating rubber part to ensure tight closing.
  • Stainless steel internal parts for longevity.
  • Can be installed vertically or horizontally.
  • Line-sized construction enables check modules to open further, helping to reduce check fouling.
  • 1/2”, 3/4” inventoried at Guenther Supply Inc

LF288A Vacuum Breaker

  • Prevents the reverse flow of polluted water from entering into the potable water supply due to back-siphonage.
  • Lead Free* brass body construction (LF288A) or chrome finish (LF288AC), chemical resistant silicone seat disc, and an atmospheric vent to prevent spilling.
  • Full size orifice to assure pipe size capacity and maximum flow.
  • Ideal for low flow, non-continuous hot or cold water health hazard installations such as on laboratory equipment.
  • Maximum Pressure:125psi (8.6 bar).
  • 1/2”, 3/4”,1”, 1-1/4” inventoried at Guenther Supply Inc

LF8B Vacuum Breaker

  • 3/4 inch lead free brass hose connection vacuum breaker permits the attachment of portable hoses to hose thread faucets and prevents the reverse flow of polluted water from entering into the potable water supply due to back-siphonage.
  • Lead free body construction, stainless steel working parts, a rubber diaphragm and disc, a draining stem, and a break-away set screw for tamper resistant installations.
  • Ideal for inside and outside, health hazard installations requiring non-continuous pressure such as service sinks, swimming pools, photo developing tanks, laundry tubs, wash racks, dairy barns, marinas, and general outside gardening uses.
  • Maximum pressure is 125 psi (8.6 bar).
  • Inventoried at Guenther Supply Inc

LFNF8 Vacuum Breaker

  • 3/4 inch hose bibb vacuum breaker is designed specifically for wall and yard hydrants to prevent the reverse flow of polluted water from entering into the potable water supply due to back-siphonage.
  • Lead free body construction, stainless steel working parts, a rubber diaphragm and disc, and a draining stem.
  • Permits manual draining for freezing conditions.
  • Maximum pressure is 125 psi (8.6 bar).
  • Inventoried at Guenther Supply Inc

Backflow Repair Kits and Accessories Inventoried at Guenther Supply Inc

  • 909 1st and 2nd Check Kits, Complete Rubber Kits, Relief Valve Kits
  • 919 Complete Rubber Kits, Total Repair Kits
  • 957 Complete Rubber Kits
  • 009 1st and 2nd Check Kits, Complete Rubber Kits, Total Repair Kits
  • 9D 1/2 and 3/4 Repair Kit
  • 909, 919, 957 Air Gaps