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Genuine Wilden Model: 02-3880-99 Pilot Sleeve Assembly. :
$128.79
The **Wilden 02-3880-99** is a genuine OEM replacement **pilot sleeve assembly** designed specifically for Wilden 1” (25 mm) air-operated double-diaphragm (AODD) pumps utilizing the Pro-Flo® air distribution system.
This precision-engineered internal component houses the pilot spool, critical for directing air signals that drive the pump's shifting mechanism. It ensures accurate pneumatic timing, prevents operational stalling, and maximizes efficiency in compact, light-to-medium-duty industrial fluid transfer applications.
