Vacuum Flange: – Aluminium Flanges with Silicon O– Ring & Vacuum Gauge for Vacuum or Gas purging application Harrier Offer matching Aluminium flanges. These flanges are made as per tube dimension to avoid any leakage of vacuum or gas during application. All Dimensions are in mm. Inner Diameter 65 mm Tolerance beyond 24 mm OD to 100 mm OD: ±0.5to