This is a pair of smart sealing assembly for the tube vacuum furnace to tighten both ends of OD 80 mm tube without any welding and gluing.

• Made of Stainless Steel with double high-temperature silicon O-rings on each flange.
• On one end the flange has a vacuum meter with a valve attached, and on the other end has the only valve.
• Seal tube by tightening screws on the flange without any welding and glue.
• 1/4" hose connector in the both of ends.
• 1/4" in diameter vacuum sealing assembly will connect with 1/4" rubber hose.
• Designed for MTI OTF-1200X-80 tube furnace.
• Excellent for any type of tubing: ceramic, glass, quartz and steel pipe.
• The assembly kit will seal 80 - 82 mm diameter (3-1/8 ~~ 3-1/4" Dia) of the quartz tube.

Package included	One flange with gauge and valve, one flange with valve, two steel sealing rings, four high-temperature silicone O-rings  ( 300oC Max., and six screws
Vacuum Level	10E-2 torr by a mechanical pump 10E-5 torr by a small turbopump and  10-6 torr by hi-speed turbopump
Installation video
How to seal a quartz tube using the assembly, please follow the photos below:
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 gasses with our flange assemblies. Please contact us with any concerns.
Optionals	Please click here to order digital vacuum gauge for precision vacuum control up to 10-4 torr  For CVD application, please choose anti-corrosive vacuum gauge ( click pic below left 2 ) You can choose various end of fitting as options ( click here to order separately ) You may click here order a flowmeter to control gas flowing  You may order flange support to avoid tube turning ( picture below right)