Apollo started production of the 4ANLF Series in 2009. Domestic Stainless Steel Body 2-1/2"-8", FDA Fusion Bonded Epoxy Ductile Iron 10" & 12". Flow Configurations in Vertical Up/Vertical Down, or Vertical Up/Vertical Up. Center Stem Guided TriForce™ Check Valves for Low Pressure Drop. Butterfly, OSY, NRS Shutoff Options. 2-1/2"-12".