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Identifying an Old Hardie 1-Inch Valve (25+ Years) for Diaphragm Replacement

Jack has a photo of a vintage Hardie 1″ valve stamped “HARDIE” (not Richdel or Irritrol). The expert identifies it as a Hardie 100 series valve. Hardie was acquired by Irritrol, and parts for the 100 series are increasingly scarce.

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Search contractor suppliers: Ewing Irrigation, SiteOne, John Deere Landscapes sometimes stock legacy diaphragms (part #100-DIA or similar). Call with the photo.
Online marketplaces: eBay, Amazon occasionally list “Hardie 100 series diaphragm”.
Replace the entire valve: Strongly recommended. A new 1″ anti-siphon valve (Rain Bird DV, Hunter PGV, Irritrol 205) costs $25–$40 and installs in 30 minutes with basic PVC tools.

Why Replacement Beats Repair

Old PVC becomes brittle; disturbing it risks cracks.
New valves have better flow characteristics and reliable diaphragms.
Labor to find, order, and install an obsolete part often exceeds the cost of a new valve.

If you must repair, shut off water, remove the bonnet, take the old diaphragm to a supplier for matching. But budget for a full replacement if the body shows cracks or the solenoid is corroded.

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