80 steel a top ball valve 20 is attached to the housing top port nipple 18 for alternately opening or closing the housing top port nipple 18 a full port 2 inch i d ball valve is utilized for the top ball valve 20 in this preferred embodiment sticks are loaded through the top ball valve 20 through the housing top port 18 and into the housing 12 the housing bottom 16 is accessible through a housing bottom port swage 22 which in this preferred embodiment is a 21 2 inch i d to 2 inch i d swage made of schedule 80 steel for servicing convenience a hammer union 24 is attached to the housing bottom port swage 22 a 2 inch i d nipple 26 made from schedule 80 steel extends downwardly from the hammer union 24 to a bottom ball valve 28 for alternately opening and closing the housing bottom port nipple 22 for passage of a stick a full port 2 inch i d ball valve is utilized for the bottom ball valve 28 in this preferred embodiment although pressure sensitive or liquid sensitive check valves can be used in other preferred embodiments both the top ball valve 20 and the bottom valve 28 are rated at 2000 psi in this preferred embodiment an equalizer line 30 is provided in this preferred embodiment with a first equalizer valve 32 and a second equalizer valve 33 positioned on the equalizer line 30 the equalizer.