DRUM BUNG ADAPTERS CREATE COMPATIBLE CONNECTIONS FOR INSTALLING PUMPS ON PLASTIC DRUMS. ITS HIGH-QUALITY POLYPROPYLENE CONSTRUCTION IS RATED TO 150 PSI AND SUITABLE FOR USE WITH MOST PLASTIC DRUM CHEMICAL CONTENTS THREAD COMPATIBILITY DETAILS UL STYLE""MARGIN-TOP0PX; PADDING-TOP 5PX; PADDING-BOTTOM 5PX;"" S56X4 TRI SURE MALE BUTTRESS 56.0MM (2.20"") OUTSIDE DIAMETER AND 50.0MM (2.00"") INSIDE DIAMETER WITH 4.0MM (.158"") THREAD PITCH (DISTANCE BETWEEN THREADS) REFER TO KEY S56X4 IN REFERENCE CHART.