Abstract: The invention relates to a retainer in the form of a circlip for holding a connector or the like in a bore in a wall. The connector has a peripheral groove for receiving the circlip and the circlip has inwardly extending lugs at its free ends and an integral tongue on its inner periphery at an intermediate position around the circlip. The circlip also has three cam-like projections at its free ends and intermediate locations. A connector to be located in the bore in the wall is inserted through the bore with the circlip in place and the projections cause the circlip to be pressed into the groove in the connector as the circlip passes through the bore. Once through the bore, the circlip springs outwardly to engage behind the wall and retain the connector in place.

Abstract: The disclosure relates to a tube coupling sleeve having a throughway open at one end to receive an end part of a tube to be coupled therein. The sleeve has an end stop spaced from the open end to define the limit of insertion of the tube in the sleeve and an inner integral hollow spigot extends along the sleeve from the end stop through the open end of the sleeve to project into the tube. The outer surface of the spigot has annular ridges or ribs to grip the inner surface of the tube and hold it in place. The closed and of the sleeve has an encircling head to fit in a bore in a body and the head has an encircling steel star washer to lock the head in the bore.

Abstract: In a coupling formed of two components, one of which has a body portion with a bore having a taper to give a decreasing diameter towards an entry end of the bore, a collet having resilient arms being located in the bore and the second component having a tube adapted for insertion into said collet through the entry end to be gripped thereby, the tapered bore causing the grip to be tightened if the second component is pulled in the outward direction from the bore in the first component, in order to prevent separation of the components after assembly, the collet has a portion protruding out of the first component through said entry end of the bore and the second component has a portion extending around the protruding end of the collet and the two components having surfaces which abut to prevent the collet being pressed inwardly into the bore in the first component by moving the two components towards one another.