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Product Test Hole Quadrant Handle Insulation Pin Nylon Clamps Materials Metal Alloy Metal Alloy Aluminium Nylon Sizes 1-5/8" 3/8" & 1/2" 1-1/2" & 2-1/2" DC 8 (8" & below) DC 12 (8" - 12") Features Provide opening for measuring air velocities and static pressures. Designed for controlling the volume control damper in ductwork system. Provide a mean to secure a variety of insulation materials in both metal and concrete surfaces. For securing flexible ducting to the collar. Technical Specification

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