2 Way Double Ended Valve Stem Core Remover/Installer Float Tubes. Valve Core Remover is useful of its two way design. Double Ended Core Remover: One end fits standard bore, one fits larger. Float Tubes Installer is great for letting the air out of inner tubes after floating the river or snow tubing. Great for tire changer operation and repair. Will work on any inflateable with a valve stem and core. (tires, inner tubes, ....etc).