A pocket former comprising: a pocket former body (101, 201, 301, 401), the pocket former body (101, 201, 301, 401) having an outer surface, a pocket former first portion and a pocket former second portion; collapsible elements (103, 203, 303, 403), the collapsible elements (103, 203, 303, 403) formed on the outer surface of the pocket former body (101, 201, 301, 401), the collapsible elements (103, 203, 303, 403) extending radially outwardly from the pocket former body (101, 201, 301, 401); and pocket former bridges which are oriented longitudinally along the pocket former body such that, when sufficient force is applied to the pocket former bridges, the pocket former bridges break and the pocket former body separates into two or more longitudinal segments, or a collapsible element (103, 203, 403), the collapsible element (103, 203, 403) formed on the outer surface of the pocket former body (101, 201, 401), the collapsible element (103, 203, 403) extending radially outwardly from the pocket former body (101, 201, 401); and a pocket former bridge coupling pocket former second portion to the collapsible element (103, 203, 403), wherein the pocket former bridge (205, 405) is less thick than the pocket former body (101, 201, 401) or includes a cut or slit formed in the pocket former body (101, 201, 401) and wherein, during use, the pocket former bridge (205, 405) seals against infiltration of concrete into an interior of the pocket former body whilst providing a structurally weakened area to allow separation between the collapsible element (103, 203, 403) and the pocket former second portion such that the collapsible element (103, 203, 403) will collapse inwards into an interior of the pocket former. a pocket former body (101, 201, 301, 401), the pocket former body (101, 201, 301, 401) having an outer surface, a pocket former first portion and a pocket former second portion; collapsible elements (103, 203, 303, 403), the collapsible elements (103, 203, 303, 403) formed on the outer surface of the pocket former body (101, 201, 301, 401), the collapsible elements (103, 203, 303, 403) extending radially outwardly from the pocket former body (101, 201, 301, 401); and pocket former bridges which are oriented longitudinally along the pocket former body such that, when sufficient force is applied to the pocket former bridges, the pocket former bridges break and the pocket former body separates into two or more longitudinal segments, or a collapsible element (103, 203, 403), the collapsible element (103, 203, 403) formed on the outer surface of the pocket former body (101, 201, 401), the collapsible element (103, 203, 403) extending radially outwardly from the pocket former body (101, 201, 401); and a pocket former bridge coupling pocket former second portion to the collapsible element (103, 203, 403), wherein the pocket former bridge (205, 405) is less thick than the pocket former body (101, 201, 401) or includes a cut or slit formed in the pocket former body (101, 201, 401) and wherein, during use, the pocket former bridge (205, 405) seals against infiltration of concrete into an interior of the pocket former body whilst providing a structurally weakened area to allow separation between the collapsible element (103, 203, 403) and the pocket former second portion such that the collapsible element (103, 203, 403) will collapse inwards into an interior of the pocket former.