Edwards nXR Gas Ballast Adapter for nXR60i and nXR90i Multi-Stage Roots Vacuum Pumps. PN: A73501811
Gas Ballast Adaptor For Inert Gas Supply Connection (1/4" Quick Connect)

These Edwards nXR gas ballast adapters fit the nXR60i and nXR90i series multi-stage Roots vacuum pumps. A gas ballast adapter may be fitted in place of the gas ballast control on these pumps which allows for connection to inert gas line (1/4" quick connect). Works with all nXR60i and nXR90i series pumps. The adapter allows you to connect a controlled supply of inert gas to the pump. Edwards Part Number is A73501811.