I am very disappointed to see that Orbit does not sell the diaphragm for this valve. 15 years ago I purchased this brass valve for the durability versus a plastic product. Well guess what–I have 5 useless brass valves that I paid a lot of money for.
It is very difficult not to be bitter about this. I feel like I have been ripped off !!!
Totally understand your frustration. It’s disappointing when parts for durable products aren’t supported long-term. You might want to try reaching out to Orbit’s customer service directly — sometimes they have replacement parts not listed online or can suggest a compatible alternative. Also, a few plumbing supply stores might carry third-party diaphragms that fit. Worth checking!