23-21 Liquid helium dewars

100-litre liquid helium dewars have started leaking and three of them are now out of order. To prevent the cancellation of future experiments requiring liquid helium and ensure minimal helium losses, we must replace 25 dewars. These dewars will have to comply with the following specifications and be delivered with construction and conformity documents:  100 L capacity,  ADR conformity for transportation on public roads,  Made from non-magnetic materials to be used in high magnetic field areas (aluminium preferred),  Standard KF 50 or 40 flange on the neck,  Pumping valves with their tools, if needed, to be able to re-pump the insulation vacuum,  Vessel delivered with Pi () mark,  Safety valves must be set to 0.7 bar,  Roller for hand transportation in the facility. Delivery time is a very important aspect of this contract. A commitment on delivery dates would be highly appreciated.