The Apollo Valves 4ALF208A2F represents engineering precision in 2-inch bronze reduced pressure zone backflow prevention technology. This lead-free bronze assembly delivers maximum contamination protection through its distinctive modular check valve cartridge design, establishing itself as the definitive solution for commercial and industrial potable water supply systems requiring 175 PSI operational capability. Manufactured under the RPLF4A Series specifications, this 37.4-pound bronze assembly incorporates dual integrated ball valves with stainless steel handles and SAE-threaded test cocks. The unit's 20-1/8 inch overall length accommodates standard horizontal installation requirements while maintaining NSF 61 water quality certification and NSF 372 lead-free compliance for drinking water applications. This specific MPN 4ALF208A2F model features captured spring technology within its top-accessed modular cartridges, enabling field-serviceable maintenance without complete assembly removal. The bronze construction utilizes C89836 material specifications, providing superior corrosion resistance and longevity in municipal water supply environments where backflow prevention system integrity remains critical for public health protection. Bronze C89836 Construction & Lead-Free Material Engineering Excellence The 4ALF208A2F employs premium C89836 bronze alloy construction throughout its main body assembly, delivering exceptional resistance to dezincification and stress corrosion cracking. This specific bronze formulation provides the optimal balance of mechanical strength and corrosion resistance required for reduced pressure zone applications operating at maximum 175 PSI water pressure conditions. Lead-free certification under NSF 372 standards ensures this Apollo backflow preventer meets Federal Public Law 111-380 requirements for potable water contact surfaces. The bronze casting process incorporates precise dimensional tolerances that maintain proper sealing surfaces between the modular check valve cartridges and the main valve body, preventing internal bypass conditions that compromise backflow prevention effectiveness. Unlike competitive brass models such as Wilkins Zurn 975xl assemblies, this bronze construction provides enhanced durability in challenging water chemistry conditions. The C89836 bronze alloy resists mineral buildup and corrosion that frequently affects standard brass backflow preventers in high-mineral water supply systems. Modular Check Valve Cartridge Technology & Captured Spring Design The 4ALF208A2F integrates Apollo's proprietary top-accessed modular check valve cartridges featuring captured spring assemblies that eliminate spring loss during maintenance operations. These cartridges incorporate reversible silicone seat discs that provide dual-surface sealing capability, extending service life while maintaining precise closure characteristics under varying water pressure conditions. Each modular cartridge within this 2-inch assembly utilizes replaceable seats and spring-loaded mechanisms designed specifically for reduced pressure zone operational requirements. The captured spring design prevents internal component migration during pressure fluctuations, ensuring consistent check valve performance throughout the assembly's operational lifespan in commercial plumbing applications. This double check valve configuration creates redundant protection superior to single check valve systems, providing fail-safe operation when the primary check valve experiences seat wear or debris interference. The modular design
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