TwistMate AN Step connectors calibrate flow transmitters on flow benches. These connectors simplify flow bench step tree connections with their fast, leak-tight threaded connections that do not use thread sealant or wrenches, and minimal force. The step connectors, or transitions, are specifically designed for the aerospace industry, providing incremental transitions from AN 32 down to AN 4 to allow simple calibration of flow from different sized aircraft transmitters. AN Step connectors allow connection to a flow source with a male AN fitting of the required sizes from AN 6 up to AN 32. To step down to the appropriate AN female flow tube connector, AN reducer or step-down connectors are available to match up with the application. These connectors are made from stainless steel material with easily replaced seals.