The Dilvac '990' Series represents the complete answer in low-cost, high efficiency Dewar Flasks. Utilising the proven borosilicate glass inner vessels, the '990' Series features a tough, blue plastic, shock-absorbing container with many safety features. The unit is easily dismantled to facilitate refill changes and all models include a coated handle and a 'push-fit' insulated lid, vented for safe handling of all liquid gases.