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The last 4 posts
Irritrol R719901 Replacement Bonnet for HR1 Non-Flow Control Valves
The Hardie Hydro-Rain HR-1 has the Pat.No. 3591126 on the bonnet
Irritrol R719901 Replacement Bonnet for HR1 Non-Flow Control Valves
(duplicate postings by this guy - he has the old-old Hydro-Rain valve)
I'm not exactly sure which valve that is. A picture would help.
If the 1" Irritrol 100 valve pictured below looks like it'll work then you'll either need to buy a whole new valve and harvest parts or buy a retro-fit kit. You wont be able to use your old diaphragm with a new bonnet. They're double beaded now. I'm assuming you mean the top half of the valve from what you've stated in your post
Hardie 3591126 valve - Housing Crack
Any chance you might have one of these. Id hate to replace the entire valve seeing it would involve tons of re-piping.
Thanks Steve