Telescopic pumpable props

A grout fillable prop comprising an inner member and an outer member adapted for movement between an extended use position and a retracted position, a grout inlet in an upper part of a sidewall of the outer member to allow grout to pass into the prop, the inner member and the outer member having wall portions with plastic properties and being self-supporting, an installation fitting fitted to the grout inlet and adapted to hold a grout filling tool without the use of separate fasteners, the installation fitting having a guide adapted to capture a coupling on the tool and an opening adapted to accommodate a key on the tool, the installation fitting enabling the tool to be lifted into and out of engagement with the fitting, a one way valve fitted to the installation fitting, the one way valve comprising a length of lay flat hose one end of which is attached to the installation fitting, the hose locatable inside the prop when the installation fitting is attached to the prop, and a grout filling tool having an elongate pipe portion having a lower end adapted to connect to a grout hose and an upper end containing a coupling which has an outwardly extending flange adapted to be captured by the guide on the installation fitting and a depending key adapted to pass through the opening in the installation fitting, wherein the tool is adapted to be lowered into engagement with the installation fitting to enable grout to be pumped into the prop and is adapted to be lifted out of engagement with the installation fitting after the prop is filled with grout.