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Left side flange with 1/4" Feedthrough for 4" tube - EQ-FL-101-FT(L)

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This is the left side of the smart sealing assembly for vacuum tube furnace to seal one end of OD 100-102 mm ( 4") tube without any welding and gluing.


  • 1/4" Feedthrough
  • Mechanical Pressure Gauge
  • 1/8" NPS Valve
  • Barbed Fitting for 10mm O.D. tube.
  • 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.
  • Excellent for any type of tubing: ceramic, glass, quartz and steel pipe.
  • Vaccum level: 10-5 torr by molecular pump and 10-2 torr by mechanical pump
  • One end flange has a barbed needle valve,1/4" feedthrough for thermocouple inserted  and 1/8 NPS valve  with installed  Mechanical Pressure Gauge.  (if you need Compact Digital Vacuum Gauge , please choose from product option at extra cost . If you don't need vacuum gauge, please instruct us when you order, we can take it off, but no price deduction )  
  • 1/4" in diameter vacuum sealing assembly will connect with 1/4" rubber hose.
  • Designed for MTI OTF-1200X Desk-top Quartz Tube Furnace.
  • Excellent for any type of tubing: ceramic, glass, quartz and steel pipe.
Installation Video
Dimensions    Click to enlarge
  • 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.
Optional Click here to order other size  vacuum flange.               Click pic to order KF40 to KF25  adaptor if you need KF40 port

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