The 4A series is a reduced-pressure assembly. Production began in 2008. All valves are now fully lead-free bronze body (LF) construction The check covers are a threaded access style. The check components are a modular glass-filled PPO plastic and can be removed from the body for repair. Spring tension is contained when the check covers are removed. Check discs are silicone. The relief valve utilizes a bolted access cover. Spring tension is contained when the cover is removed. The letter “n” in the model designation refers to the n pattern assemblies with the up and down installation orientation in sizes 20 (3/4") and 25mm (1")
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