Petromech servizi manufactures and remanufactures crossover spools, that is a flanged wellhead connection that is designed to seal around and suspend an inner casing string. This is also designed in a manner that allows for a pressure increase from one side of the spool to other. Cross over spools have end connection that differ from one another in nominal size and pressure rating. Cross over spools are used for bop space out and wellhead hookups, basic material of construction is alloy steel.