Series 775 Double Check Valve Assembly
SIZE RANGE: 1/2" through 2"
Series 775 Copper Body double check valve assembly shall be installed at each noted location. The assembly shall consist of two threaded-in check modules with captured springs and silicone seat discs. Seats and seat discs shall be replaceable without the use of special tools. Service of all internal components shall be through a single access cover secured with stainless steel bolts. The assembly shall include two nickel-plated resilient seated isolation valves, four top mounted test cocks. The assembly shall have a electroless nickel-plated tubular copper body.
Pressure / Temperature
Suitable for supply pressure up to 175psi (12 bars) and water temperature
up to 180°F (82°C) continuous

Series 9D Dual Check Valves with Intermediate Atmospheric Vent
SIZE RANGE: 1/2" & 3/4"
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. It consists of a brass body with stainless steel internal parts, integral strainer, and two durable, tight-sealing, rubber check valves. Series 9D is 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.
Pressure / Temperature
Minimum Working Pressure: 25psi (172kPa), Maximum Working Pressure: 175psi (12.06 bar).

Series 709 Double Check Valve Assembly
SIZE RANGE: 2½" through 10".
Series 709 Double Check Valve Assemblies are designed to prevent the reverse flow of polluted water from entering into the potable water system. This series can be applied, where approved by the local authority having jurisdiction, on non-health hazard installations. Series 709 features a modular check design concept to facilitate easy maintenance. Check with local jurisdictional authority as to installation requirements.
Pressure / Temperature
Temperatures Range: 33°F – 110°F (5°C – 43°C) continuous, 140°F (60°C) intermittent
Maximum Working Pressure: 175psi (12.06 bars)

Series 774 Stainless Steel Double Check Valve Assembly
SIZE RANGE: 2½" through 12".
Series 774 Double Check Valve Assemblies are designed to prevent the reverse flow of polluted water from entering into the potable water system. This series can be applied, where approved by the local authority having jurisdiction, on non-health hazard installations. Features short end-to-end dimensions, light weight stainless steel body, and the lowest head loss available.
Pressure / Temperature
Temperature Range: 33ºF-110ºF (5ºC-43ºC) continuous.
Maximum working pressure: 175psi (12.06 bars)

Silver Eagle Series
SIZE RANGE: 2½" through 10".
Watts SilverEagle Series are the lightest and most compact backflow prevention assemblies in the industry. Series 757/757N Double Check Valve Assemblies are used to prevent backflow of non-health hazard pollutants that are objectionable but not toxic, from entering the potable water supply system. Series 757/757N may be installed under continuous pressure service and may be subjected to backpressure and backsiphonage. Series 757/757N consists of two independently operating check valves, two shutoff valves, and four test cocks.
Pressure / Temperature
Temperature Range: 33°F – 140°F (5°C – 60°C)
Maximum Working Pressure: 175psi (12.06 bars)