Abstract: An indicating device, for a pressurized tank having a slotted cap covering a valve attached to the tank, has a flexible arcuate bifurcated body member. The flexible arcuate bifurcated body member has a first arm member and a second arm member forming a retaining slot and a retaining slot entrance channel. A flexible insertion handle member attaches to the flexible arcuate bifurcated body member. There is a first locking surface on the flexible arcuate bifurcated body member and a second locking surface on the flexible arcuate bifurcated body member. A first guide member is attached to the first arm member and a second guide member is attached to the second arm member. There may be a first deflection surface on the first guide member and a second deflection surface on the second guide member. There may be at least one indicia application surface on the flexible insertion handle member.