Watts 88004111 3/4 IN Lead Free Reduced Pressure Zone Backflow Preventer Assembly, with Quarter Turn Shutoff Valves, Tee Handles, Backflow Flood Sensor

Both ends of the Watts LF009 88004111 are 3/4 inch female NPT threaded (20 mm metric), so it mates directly to 3/4 inch threaded male pipe or nipples on the inlet and outlet. It is an inline body pattern, meaning the inlet and outlet run in a straight line rather than offset, so plan the rough-in accordingly.

Yes. The LF009 88004111 is a reduced pressure zone assembly rated for health hazard protection, and it guards against both backpressure and backsiphonage. That combination is what codes call for on high hazard cross connections. It is also rated for continuous pressure service, so it can sit under constant line pressure rather than only intermittent use.

The body is a lead free copper silicon alloy, which is why it carries the LF prefix in the LF009 series designation. That makes it suitable for potable water service where lead free construction is required. Internals use a silicone disc and an engineered plastic seat.

No, shutoffs come on the assembly. The 88004111 ships with quarter turn ball valves on both the inlet and the outlet, fitted with tee handles. It is a testable assembly, so it can be certified in place at annual inspection. A strainer is not included, so if your supply carries debris you will want to add one upstream.

The 88004111 version of the LF009 includes a backflow flood sensor, which monitors the relief valve discharge. An RPZ relief port can dump water when the assembly fouls or the supply pressure fluctuates, and indoors that means water damage. The sensor is there to flag that discharge so it gets caught before it becomes a claim. That is the main reason property managers and facility staff pick this variant over a plain LF009 for interior mechanical room installs.

Rated to 175 psi (12 bar) maximum working pressure, with a service range of 33 to 180 degrees F (0.5 to 75 C). That covers standard domestic cold water service comfortably. It is not built for hot or harsh water duty, so do not put it on a recirculating hot water or process line above that range.

Two things to check before you commit. The 88004111 is UL Listed and meets the USC 9th Edition, which is what most approval authorities reference for RPZ assemblies. However, it has no bypass and no meter. If your specification calls for a bypass line or a metered bypass on the assembly, this is not the right unit and you need a different LF009 configuration or a larger assembly built with one.

It depends on the hazard. A double check assembly is only acceptable on non-health-hazard (pollution) connections. The LF009 88004111 is a reduced pressure zone assembly rated for health hazard service and protects against backpressure and backsiphonage, which is the class of device required where backflow could introduce a contaminant that causes illness, such as boiler treatment chemicals, irrigation with fertilizer injection, or medical and lab equipment. If the inspector has cited a health hazard, a double check will not satisfy it.

No elbow fitting and no cap and tether are included with the 88004111. If your install needs the relief port piped to a drain, you will need to source the air gap drain fitting or elbow separately and keep the required air gap at the receptor.

Bare alloy. The finish is cast copper silicon alloy, with no polymer coating applied. For buried or highly corrosive exterior environments where a coated body is specified, this is not the configuration to order.