These sampling tubes are adjustable to permit the culture fluid to be sampled at any desired level. Tubing is 1/4” OD.Like-for-like replacement parts for Applikon® Biotechnology and Broadley-James® brands of bioreactors.Applikon® is a registered trademark of Applikon Biotechnology, Inc. Broadley-James® and Broadley-James Corporation® are registered trademarks of Broadley-James Corporation.