Designed to protect #2807A and #2813C 15-watt BL and BLB tubes from shock and accidental breakage, this rigid PVC tube is 1-5/16″ (3,3cm) O.D. in diameter x 18-1/2″ (47cm) long. An end cap fits snugly over one end for use with a collecting light. The item is also useful for protecting replacement tubes when traveling. A plastazote foam plug is provided so that a spare tube can be secured at both ends.