This is the Vacuum Sealing Flange for a 2" vacuum furnace to seal the OD 50-52 mm ( 2") tube without any welding and gluing. SPECIFICATIONS Features Special designed flange for KSL-1100X-S-H Seal tube by tightening screws on the flange without any welding and glue. Made of Stainless Steel (SS304) with double high-temperature silicon O-rings on each flange. Click the picture below to order a digital vacuum gauge for mechanical gauge replacement. Structure Mechanical Pressure Gauge Two Needle valves with barbed fitting for 10mm O.D. tube 1/4" tube fitting on the inside of the flange Vacuum Level Vacuum level: 10E-5 torr by molecular pump and 10E-2 torr by mechanical pump Warning Must put a refractory tube block in front of the flange (see picture below) to avoid heat radiation melt silicone O-ring. You order a ceramic block in related products. Please do not over-tighten the three hex screws on the flanges to avoid overpressure incidents. The recommended torque is 35~40 inch-lbs. For liability considerations, MTI does not recommend or endorse the use of any toxic, flammable or corrosive gases with our flange assemblies. Please contact us with any concerns. Application Notes Click here to order a complete set. Click pic to choose other size flange Vacuum Pump & High Vacuum Station