Thanks for the insight Joe... The garden hose fertilizer spray opened my eyes up.... It's probably the only time I'd have any concern regarding my outdoor connection. I'm surprised that this is not mandatory for residential everywhere.
I'll check into buying the backflow preventer next trip out. $5 won't hurt.
Lonestar 24" Vertical offset w/ Insulated Firebox & Performer Platinum
Former owner: Jambo Backyard, Klose BYC, Med. Spicewine, Pitts & Spitts, XL & (2) Med. BGE's, 22" WSM & (2) 18" WSM's, 18" & 22" Weber Kettles