Replacing a Hardie Valve Diaphragm with Bell-Shaped Stem

Hardie valve diaphragm has a stem with a bell-shaped piece larger than the valve body opening.

Explanation

• The rubber washer (diaphragm) is larger than the seat—it sits on top, not inside the hole.
• Buy a complete diaphragm assembly (stem, nut, rubber). The stem's metering pin often wears out.
• Sizes: 1", 1.5", 2". Match the old one.
• Orientation: plastic stem up, nut on bottom. Two tabs on valve body align with diaphragm holes for correct positioning.

If the seat in the valve body is cracked (common after 10+ years), replace the entire valve with a Rain Bird DV-100 with flow control.