1.1 This European Standard specifies requirements for connectors intended for use with medical gases. 1.2 This European Standard specifies the dimensions and the allocation of non-interchangeable screw-threaded (NIST) connectors intended to be used at nominal operating pressures not greater than 1 400 kPa. NOTE As stated in EN ISO 5359, gas-specific quick-connectors conforming to EN ISO 9170-1 are considered as an alternative to NIST connectors. 1.3 The information to be supplied by the manufacturer is excluded from the scope of this European Standard because information about the use of NIST connectors is supplied by the manufacturer of each medical device to which the connectors are permanently fitted.