In the hard freeze this weekend, I personally helped two homeowners with their burst BFPs and heard about a third. Here is a YouTube video from Houston of how to drain your own BFP to prevent freezing.
Here are the instructions in print, including to leave the valves at 45 degrees to prevent trapping water inside the valve body when fully open.
My Lennar house has a Wilkins 720-A and a nearby Meritage uses a Febco 765-1. Here they are on Amazon:
Here are the repair kits:
If yours is completely broken and you need to replace it before irrigation season begins again, some companies make a freeze-prevention BFPs:
Leave the Valves Halfway
The builder for Gehan homes just came by my house. He said he drained all the Gehan spec homes' BFPs, but they all burst at the valve body. He had opened the valves completely, which traps a small amount of water inside the valve ball.
Burst Backflow Preventer
Thanks, Mitch. We'll be using this info, unfortunately!
Plumber to do the Work
I have been reminded that our own neighbors Michele and Toby McDaniel at 5934 Green Meadows Lane operate a plumbing business called TM Lonestar Plumbing. Their contact information is here:
Toby says he only does Commercial New Construction. My error.
765-1 from ebay - Ships from Spring, TX
A little cheaper than Amazon, and I'll get it in two days.
You too, eh?
Nice find and thanks for sharing your information!
eBay now says the seller is on vacation for the week.
Jan 2019 Freeze
Looks like it's time to review this information again. Hopefully no one awakes to a house-side fountain on Sunday morning!
Bumping this thread for the predicted overnight freeze.