www.pmmag.com/articles/88514-apollo-lead-free-backflow-prevention
Apollo Lead-Free Backflow Prevention
July 1, 2005

Apollo®'s new lineup of Series 4D Defender™ backflow prevention products are completely lead-free and offer low head loss. Sized from 2 1/2 inches to 10 inches, the new series features a patented all-stainless-steel check valve design in a ductile iron body.
Circle 60