Fillable Caulking Tubes are designed for use with a standard caulking gun. Great for injecting large amounts of West System® Epoxy, laying a lengthy bead of epoxy, making fillets, or injecting epoxy into holes as in hardware bonding, or repairing cracks in concrete. Can be refilled several times before epoxy begins to cure. Tubes can be refilled again after cured epoxy is popped out. Holds approximately 10 fl oz.