Johnson Level 1717-7200 Heavy Duty Aluminum Box Level, 72 Inch N/A Belt-Drive Extension Kit was designed

Belt-Drive Extension Kit was designed specifically for use with Chamberlain® Whisper Drive® and Whisper Drive® Plus belt drive garage door openers

One sensor can sense two things

Contents: 3/8"

Requires 50-70 psi of air pressure for operation

Johnson Level 1717-7200 Heavy Duty Aluminum Box Level, 72 Inch N/A Belt-Drive Extension Kit was designedHighlights: Size: 72 Inch Aluminum Non Magnetic Patented "Glo View" recharges the vial surrounds from light sources for easy read in low light; doomed level vial offers 320 degree visibility; large comfortable rubberized hand grips; reinforced aerospace aluminum allow frame Removable end caps designed for finish carpentry work when measuring into corners "GripTight" non slip end caps hold level firmly into place with just one hand