Vacuum Suction Cup Level Compensators Spring Loaded Vacuum Cup Suspension Assemblies with Vibration-Resistant Split Aluminum Collars SLSA-3 Series (1/4″-18 NPT Thread) Part Number: SLSA-399VR Part No. Connection Thread Size Travel in. (mm) Height in. (mm) Required Panel Hole Dia. in. (mm) Maximum Panel Thickness in. (mm) Item Weight oz. (grams) N/A SLSA-399VR 1/4″ NPT male 6.16 (157) 8.00 (203) 0.81 (21) 0.66 (16 mm) 0.52 (0.23)