Abstract: By employing two independent, separate and distinct flow paths which are controllably sequentially opened during use in a single actuation operation, an error-free, flame and explosion proof liquid delivery/filling system is achieved. In the preferred embodiment, both flow paths are normally maintained in a closed, sealed configuration, requiring an actuation force to controllably, sequentially open the flow paths. Furthermore, the preferred embodiment is compact in design and provides an easy to use system, without sacrificing its inherent benefits. In addition, a flow diverging structure is mounted in the liquid flow path to assure complete removal of all of the air from the chamber being filled.