Mean Streak Permenant Marking Stick, White, Bullet Tip, 12 Count no checkout Brass construction provides long service Brass construction provides long service life Non interchangeable oxygen and fuel gas connectors Instant closure on reverse flow check valves Spring loaded locking mechanism responds to fingertip action and achieves a gas tight connection Double seal socket connection on second seal Bacteriostatic additive refill Eyewash unit should be inspected regularly and water in unit should be changed at least once every six months One 8 oz bottle will preserve up to 20 gallons of potable water for up to six months twist up container Marking sticks mark on dark surfaces and write on most surfaces Specially formulated to mark on wet and oily surfaces Extra bold tip marks dark surfaces with an opaque line Waterproof formula resists fading and adheres to virtually any surface Easy to use