2-1/2" Backflow Preventer, Double Check, Lead-Free , Stainless Steel Body with Flanged NRS Gate Valves APOLLO 4ALF109022 1 2" Backflow Preventer, Double Check, Lead Free , Stainless Steel Body with Flanged Non rising Stem (NRS) Gate Valves APOLLO4ALF10902 FEATURES Domestic Stainless steel body: 2 8 FDA epoxy coated ductile iron body: 10 & 12 Easy maintenance no special tools required Snap in check retainers: 2 6 Bolted in checks: 8 12 Low pressure loss as documented by an independent laboratory Center stem guided TriForceTM check valves Approved for horizontal (2 12)