Drierite drying tubes measure 8 inch L x ¾" OD and come filled with 30 grams of indicating drierite. Tubes dry to a dew point of -100degF with a flow rate up to 300 ml/min. Acrylic construction with polypropylene end caps. Inlet/Outlet ports accept ¼" to 3/8 inch ID tubing; 20 micron porex filter is in each end.