8"

The Watts 07F is an epoxy coated cast iron single check valve. Produced in sizes 4 - 10", the 07F is no longer in production and was replaced with the SS07F. Although discontinued, repair parts are still available.

The Watts SS07F is a stainless steel single check valve. Produced in sizes 4 - 10", the SS07F is currently in production and replaced the older cast iron 07F.

The 8" Watts Series 709 Double Check Valve Assembly began production in 1973 and is still currently being produced. It features an epoxy coated cast iron body. Usually blue in color. Two cover design. The 709 uses self contained bronze check assemblies. The seats are bronze and replacable. In 2010, A lead free version was introduced, designated with a "LF" prefix. In 2013, the regular leaded devices were discontinued, Lead Free version is the only 709 available. No special tools are required for servicing

The 8" Watts Series 709DCDA Double Check Detector Assembly began production in 1979 and is still currently being produced. The early models were tagged as 709DDC which was later changed to 709DCDA. It features an epoxy coated cast iron body. Usually blue in color. Two cover design. The 709 uses self contained bronze check assemblies. The seats are bronze and replacable. In 2010, A lead free version was introduced, designated with a "LF" prefix. In 2013, the regular leaded devices were discontinued, Lead Free version is the only 709DCDA available. From 1979-1991, the bypass device was a 3/4" 709. 1991-1993 the bypass featured the 3/4" 007M1. From 1993-1998 the bypass device was the 3/4" 007M2. From 1998-present, the bypass device uses a 1/2" 007. Be sure to check the I.D. plate on the bypass for your specific device. No special tools are required for servicing

The 8" Watts 757 Double Check Assembly began production in 2000 under the Hunter name. In 2002, Watts bought the rights to the device and began production as the 757 name. The body is made of stainless steel and uses a single sliding cover. Two victaulic clamps hold the access cover in place. The check assemblies are a plastic cam check design using a self contained torsion spring. All 757 devices are lead free. No special tools are required for servicing.

The 8" Watts 757DCDA Double Check Detector Assembly began production in 2000 under the Hunter name. In 2002, Watts bought the rights to the device and began production as the 757 name. The body is made of stainless steel and uses a single sliding cover. Two victaulic clamps hold the access cover in place. The check assemblies are a plastic cam check design using a self contained torsion spring. The first two years, the bypass device was a 3/4" Flomatic DCVE. After 2002, the bypass was typically a 3/4" Watts 007M3. All 757 devices are lead free. No special tools are required for servicing.

The 8" Watts 770 Double Check Assembly was produced from 1993-1997. The body is a two cover, epoxy coated ductile iron construction. The check assemblies are stainless steel toggle linkage type. They use a vulcanized clapper plate. Check springs are contained when the cover is removed. Spring tension must be removed to repair the device. The device has replacable bronze seats, but a seat removal tool is required.

The 8" Watts 770DCDA Double Check Detector Assembly was produced from 1993-1997. The body is a two cover, epoxy coated ductile iron construction. The check assemblies are stainless steel toggle linkage type. They use a vulcanized clapper plate. Check springs are contained when the cover is removed. Spring tension must be removed to repair the device. The device has replacable bronze seats, but a seat removal tool is required. The bypass device was a 3/4" Watts 007M1

The 8" Watts 772 Double Check Assembly was produced from 1993-1997. Very similar to the 770, with exception to the shutoffs. The 772 uses a special sgutoff that are not standard. Two different sizes on the flanges make it unique. The body is a two cover, epoxy coated ductile iron construction. The check assemblies are stainless steel toggle linkage type. They use a vulcanized clapper plate. Check springs are contained when the cover is removed. Spring tension must be removed to repair the device. The device has replacable bronze seats, but a seat removal tool is required.

The 8" Watts 772DCDA Double Check Detector Assembly was produced from 1993-1997. Very similar to the 770, with exception to the shutoffs. The 772 uses a special shutoff that are not standard. Two different sizes on the flanges make it unique. The body is a two cover, epoxy coated ductile iron construction. The check assemblies are stainless steel toggle linkage type. They use a vulcanized clapper plate. Check springs are contained when the cover is removed. Spring tension must be removed to repair the device. The device has replacable bronze seats, but a seat removal tool is required. The bypass device was a 3/4" Watts 007M1

The 8" Watts 774 Double Check Assembly was produced from 1998 and is still currently in production. The body is a single cover, stainless steel construction. The cover uses a victaulic style clamp. The check assemblies are self contained plastic cam style. The cam checks are bolted into the body. All 774 models are lead free. No special tools are required for servicing.

The 8" Watts 774DCDA Double Check Detector Assembly was produced from 1998 and is still currently in production. The body is a single cover, stainless steel construction. The cover uses a victaulic style clamp. The check assemblies are self contained plastic cam style. The cam checks are bolted into the body. All 774 models are lead free. Bypass device would be a Watts 007M2 or 007M3. No special tools are required for servicing.

The 8" Watts 774X Double Check Assembly was produced from 1998-2006. Very similar to the 774, the 774X uses smaller internal parts. The body is a single cover, stainless steel construction. The cover uses a victaulic style clamp. The check assemblies are self contained plastic cam style. The cam checks thread into the body. The cam checks are self contained and disc rubbers cannot be replaced. All 774 models are lead free. No special tools are required for servicing, but a handy cam check removal tool is available to assist in removal of checks.

The 8" Watts 774XDCDA Double Check Detector Assembly was produced from 1998-2006. Very similar to the 774DCDA, the 774XDCDA uses smaller internal parts. The body is a single cover, stainless steel construction. The cover uses a victaulic style clamp. The check assemblies are self contained plastic cam style. The cam checks are bolted into the body. All 774 models are lead free. Bypass device would be a Watts 007M2 or 007M3. No special tools are required for servicing.

The 8" Watts 775 Double Check Assembly was produced from 1998-2003. The body was made of stainless steel. Single cover with modular check assemblies. Check modules thread into body. No special tools are required for servicing.

The 8" Watts 775DCDA Double Check Detector Assembly was produced from 2000-2003. The body was made of stainless steel. Single cover with modular check assemblies. Check modules thread into body. Bypass device shall be a 3/4" Watts 775 or 3/4" Watts 007M3. No special tools are required for servicing.

The 8" Watts 909 Series Reduced Pressure Zone Assemblies were manufactured from 1979 and are still currently in production. The 8" 909 is a cast iron bodied device. In 1989 the 909M1 replaced the original 909. The difference was the relief valve body changed. The relief valve bottom plug was also redesigned and the rv diaphragm was resized. Many devices were not tagged with the "M1" suffix. To be sure which model you have, you must measure the relief valve cover. The original 909 relief valve cover will have a diameter of 12" while the 909M1 will measure 9-3/4". Check valves are self contained and the relief valve is a stem type. In 2010, the LF909 was introduced to comply with the new "Lead Free" laws. All repair parts were converted to lead free in 2013. Lead free repair parts will fit both regular 909 and lead free LF909 models. All 909 models have replaceable seats and require no special tools for repair.

The 8" Watts 909RPDA Series Reduced Pressure Detector Assemblies were manufactured from 1990 and are still currently in production. The 8" 909RPDA is a cast iron bodied device with a bronze relief valve. It features two check covers and a seperate relief valve cover. Check valves are self contained and the relief valve is a stem type. In 2010, the LF909RPDA was introduced to comply with the new "Lead Free" laws. All repair parts were converted to lead free in 2013. Lead free repair parts will fit both regular 909RPDA and lead free LF909RPDA models. All 909RPDA models have replaceable seats and require no special tools for repair. The 909RPDA features a bypass assembly to meter water usage. The bypass backflow preventer was changed over the years and may be a 3/4" Watts 909, 3/4" Watts 009, or 3/4" 009M2. Please check the bypass device I.D. tag before ordering parts.

The 8" Watts 957 Reduced Pressure Zone (RPZ) began production in 2000 under the Hunter name. In 2002, Watts bought the rights off of Hunter and is still manufacturing the devices. The body is constructed of stainless steel. The 957 Series features a light weight design and short lay length. It is also offered in a number of configurations with many valve options. To access the check assemblies there is a stainless steel sleeve that will slide open. You must release the two victaulic clamps that hold the stainless sleeve. The 957 uses two self contained cam checks that use a tri-link check mechanism. Numerous repair parts are available for the 957 series devices, including rubber parts and complete parts. The relief valve can be unthreaded from the body for ease of service. The 957 uses an extrnal relief valve sensing line. There are no special tools required for service.

The 8" Watts 957RPDA Reduced Pressure Detector Assembly (RPDA) began production in 2000 under the Hunter name. In 2002, Watts bought the rights off of Hunter and is still manufacturing the devices. The body is constructed of stainless steel. The 957RPDA Series features a light weight design and short lay lengths. It is also offered in a number of configurations with many valve options. To access the check assemblies there is a stainless steel sleeve that will slide open. You must release the two victaulic clamps that hold the stainless sleeve. The 957RPDA uses two self contained cam checks that use a tri-link check mechanism. Numerous repair parts are available for the 957RPDA series devices, including rubber parts and complete parts. The relief valve can be unthreaded from the body for ease of service. The 957RPDA uses an extrnal relief valve sensing line. Numerous bypass devices were used over the years including Flomatic RPZE and Watts 919. There are no special tools required for service.

The 8" Watts 990 Reduced Pressure Zone (RPZ) was produced from 1993-1997. The body was constructed of fused epoxy coated ductile iron. Check assemblies uses a toggle linkage mechanism design. Check springs are contained when the cover is removed. Spring tension must be relieved to repair the checks. Seats are removable but a special seat removal tool is required. The relief valve assembly is constructed of bronze and threaded onto the body. An external sensing line is used.

The 8" Watts 990RPDA Reduced Pressure Detector Assembly (RPDA) was produced from 1993-1997. The body was constructed of fused epoxy coated ductile iron. Check assemblies uses a toggle linkage mechanism design. Check springs are contained when the cover is removed. Spring tension must be relieved to repair the checks. Seats are removable but a special seat removal tool is required. The relief valve assembly is constructed of bronze and threaded onto the body. An external sensing line is used. Bypass device shall be a 3/4" Watts 009 or 3/4" Watts 009M2.

The 8" Watts 992 Reduced Pressure Zone (RPZ) was produced from 1993-1997. The body was constructed of fused epoxy coated ductile iron. Check assemblies uses a toggle linkage mechanism design. Check springs are contained when the cover is removed. Spring tension must be relieved to repair the checks. Seats are removable but a special seat removal tool is required. The relief valve assembly is constructed of bronze and threaded onto the body. An external sensing line is used. Very similar to the 990, the only difference being the 992 used oversized gate valves with a non-typical flange pattern.

The 8" Watts 992RPDA Reduced Pressure Detector Assembly (RPDA) was produced from 1993-1997. The body was constructed of fused epoxy coated ductile iron. Check assemblies uses a toggle linkage mechanism design. Check springs are contained when the cover is removed. Spring tension must be relieved to repair the checks. Seats are removable but a special seat removal tool is required. The relief valve assembly is constructed of bronze and threaded onto the body. An external sensing line is used. Very similar to the 990, the only difference being the 992 used oversized gate valves with a non-typical flange pattern.

The 8" Watts 994 Series Reduced Pressure Zone (RPZ) backflow preventer began production in 1998 and is still currently in production. The body is contructed of stainless steel and uses a single victaulic coupler cover. The 994 utilizes plastic cam checks and a self contained stainless steel relief valve. The relief valve may be removed from the body by unthreading it, but use caution when doing so, as to not "squeeze" or warp the relief valve body. Check assemblies bolt into the body. No special tools are required for servicing.