What Dewar is needed for the CryoTrap when using LN2?

For good operation of the CryoTrap a Dewar with a pressure of 1.5 BAR is needed. Our advise is to use minimum a Dewar with a volume of 70 Liters.

One of the suppliers is Taylor-Wharton (Series XL 70 to XL 240), see picture. But there are also other suppliers. A 1/4 Inch Swagelok connection is needed in order to connect the 1/4 Inch tubing to the trap in the GC oven.  

Dewar