Apparatus for the insertion of a pack-off (34) into a recess (51) in a bore of a wellhead body comprises an activating sleeve (36) which has a portion (58) disposed for engagement with the pack-off (34) for the movement of the pack-off into the recess and body portions shaped for location on a datum member (52) within the bore. The activating sleeve (36) includes a plurality of apertures (65) circumferentially spaced about the activating sleeve. A running tool (50) which is adapted to move said activating sleeve into engagement with the pack-off carries spring-loaded dogs (72) each disposed in one of the apertures (65). Each of a plurality of releasing pins (71) is positioned such that it enters a respective one of the apertures (65) when the activating sleeve (36) has caused the pack-off (34) to be located in said recess (52). The entry of the pins (71) into the apertures causes depression of the dogs out of the apertures and allows the consequent release of the activating sleeve (36) from the running tool (50). (Figure 2)
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