a rear surface generally in the plane of the rear surface 43 of the plate 27 such that inner edges form the engagement means with the patient 39 s nose as is further shown in fig4 a pair of cheek area connector means 61 are provided each of the connector means 61 comprises a facial engagement plate 47 preferably produced from a firm smooth plastics material it is advantageous to produce the connector means 61 in a single moulding operation to minimize assembly and production costs the rear surface 48 of the plate 47 may include a padding material such as a sponge material although it is believed this should not be required the connector means 61 includes an outer body part 49 that has a through opening 50 adjacent to the plate 47 the opening 50 is of a size sufficient to accommodate two lengths of the tubing forming the loops 33 so that the connector means 61 may be moved therealong for reasons which will be explained hereinafter arranged outwardly of the opening 50 is a resilient clip opening 51 which may be vertically arranged as in fig4 and 4d or generally horizontally arranged as in fig4 e as is shown the tube t passes from the.