Side Load - No Hold Open. The Alpro PRO50 transom overhead door closer is designed to be concealed within the transom header bar of the door. It provides controlled closing of a single or double action aluminium door or doors. This range has a 28mm extended spindle and is available in a choice of version to suit end load or side load applications and with or without hold open facility.. Supplied complete with fixing pack. Dual closing speed to allow flexibility in closing. Independently tested to 250,000 double action cycles to EN1154. Supplied complete with arm & pivot