Wilkins Vacuum Pressure Breaker

Hi everyone I'm new to this list and am really in need of help with our irrigation system. Just started using it a few weeks ago and my wife noticed this week that the vacuum pressure breaker is leaking.I'm trying to save a call to our installer. Anyway all the zones have normal pressure. The breaker leaks when the intake valve is both closed and opened.
I don't know if it's relevant but both the turn controls for both the intake and outtake ball valves are pretty rusty. I can't turn either by hand have to use a pair of pliers to turn. I also noticed the canopy is cracked around one of the screw holes.
I opened the thing today removing the bonnet,spring, and poppet. Could not get the spider assembly out. I'm not sure what to look for with these inner parts but they seem fine.
This breaker is a Wilkins 720A installed in 2003. I have it winterized every year;last year we did it a little later sometime in June.
Any advice is appreciated. From what I've seen on the internet I could order and replace a whole new valve for less than paying for a service call.When do you know if replacing parts is the way to go?
Thanks for your help

 

Winterized in June?Just a little late.You say cracked? You have answered your own questions.Two things will fix it.Magic and replacement. and Billy Maze is dead.............Upper

 

If there is a crack in the case, you must buy a new unit. In my area, these backflow devices are required to be be inspected by a licensed inspector and re-certified each spring. Failure to do so results in the water being shut off. Usually they check out OK, but every so often the seals begin to fail and must be replaced. What was the point of winterizing in June? I start irrigating my lawn in early April and continue until mid October. That's when I blow the lines and winterize. You have to get all of the water out of the housing or it can freeze and break the case.

 

And the Long of it........Upper

 

Tip, when you replace, tighten the packing nut to each ball valve. Most of them leak ever so slightly new out of the box(contributing to the rusting handle), especially on febco's.

 

Vacumn Pressure Breaker

Need to correct myself. We winterized the unit last November don't know why I typed June! One thing I want to make sure I understand. So if the canopy itself is cracked that by itself is an indication the unit needs replacing?

 

A picture would help make sure we understand exactly what the "canopy" is. But, if this is part of the casting of the unit and not a part that might be removed and replaced, then it would require a whole new unit. It could be that a small amount of water remained after winterizing. Yeah, I often type June when I mean November At least we know you're not completely wacko!

 

Canopy

The canopy is the black plastic cover over the bonnet.

 

Story continues

I took the unit apart again yesterday and took a closer look. I guess the poppet is the rubber piece underneath the spring.Anyway there is a small tear or hole around the screw going into the top of the poppet. I guess that's enough to make it leak? Is that true? I think I'll first replace the poppet and spider assembly and canopy as the housing is not leaking and I don't want to mess with the PVC fittings as I've never done that stuff before.

 

lol,,,,lol... good one