NW50SK flange

When your dewar has this flange, our pump could fit on this dewar.

Important in this is that the outher flange size is 75 mm, inner flange ring > 51,5mm (pump is 51mm), hole size >50mm (pump is 48 mm)

When you can specify us your inner depth (size from top of the flange to inner bottom), we could build a pump on that length. For the 35 liter dewar from this picture, where the inner height is 525 mm, we build the pump with a lenght of 525-5 = 520 mm.