My parents' Watts vacuum breaker was seeping, so I bought a repair kit, which contained an o-ring and a float. The galvanized pipe feeding it looked to be about 1" od and 3/4" id, and the repair kit said it was for 3/4" -1". Unfortunately, the disc part of this float measures more than an inch in diameter, so it would not fit inside the VB opening.
Furthermore, I made the stupid mistake of unscrewing the bonnet under pressure (even though the supply was turned off). The old float shot up into the sky and disappeared into the bushes, so I don't have that to bring with me to the irrigation store. I assume I need the 1/2" repair kit, even though the feeder pipe is at least 3/4" wide. Can someone explain why this disc float is wider than my pipe?
PS: The cover on the VB is worn, so I can't read the the numbers off of it.