Side Entry Subs – Houston Downhole builds them in two styles – One where the Side Outlet is an integral part of the tool, and a type that has a replaceable Side Outlet that can be replaced if it is damaged. The Side Entry is made up between two joints of drill pipe above the BOP. It allows circulation thru the Side Outlet. If wireline equipment needs to be dropped down the string, it can be fed thru the side outlet. Either style can be rated for 10M or 15M PSI Working Pressure.