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Water Cold Sealing Flang for 3.5" ( 89 mm) dia.Tube - EQ-FG-89WC

Sale Price: Starting at USD$698.00
If you are international, please click this.

Product Options

Left, right or both:
This is a pair of sealing flange with water cooling jacket valve for OD 3.5" ( 89 mm diameter)  processing tube. If you cannot use a ceramic block in two end of tube, you must use the water cooling jacket to keep flange cool (otherwise silicone o-ring may get damage)


  • Made of Stainless Steel with double high-temperature silicone O-rings on the flange.  
  • Stainless steel needle valve with 1/4" pipe adaptor.    
  • The assembly kit will seal one end of 89-91 mm ( 3.5") diameter ceramic and quartz tube.
  • Vacuum meter is installed in one side of flange.
  • You may choose left side, right side or full set of flange at product option bar
  • Note:  You may order Digital Temperature Controlled Recirculating Water Chiller with 16L / min Flow, to cool the flange and save water. ( click picture below right to order )

Installation Video

  • Must put a refractory tube block between the flange and the sample to avoid melting the silicone O-ring by heat radiation. Please 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
  • Max. furnace working temperature is 1100ºC without thermal block if tube furnace is installed with this water cold flange
  • If furnace working temperature > 1100ºC , suggest you use a quartz thermal block  ( see related product below )
  • Please always use recirculating water chiller ( see related product below ) to save water and protect

Sealing flanges for 80mm O.D tube
Please click picture above to choose other size flange from 1" to 11"

Related Products

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1. Prices listed online are valid for US market and whom pay by credit card only. There will be extra charges for shipping & handling. Price various from country to country.
2. We may add extra charges for paper order and net30 terms due to extra labor cost.
3. The prices listed are subject to change without notice.