What is purpose of rubber ring on Honda Odyssey light?

I changed the headlight on my Honda Odyssey and found the headlight had a rubber ring around the light but I could not get it back on. The headlight works fine without it. What is the purpose of this black rubber ring and should I get it back on?What is purpose of rubber ring on Honda Odyssey light?It is there to keep water and dirt out. I would put it back on.What is purpose of rubber ring on Honda Odyssey light?
AS above and also cosmetic.What is purpose of rubber ring on Honda Odyssey light?it never ceases to amaze me how many people try to do out-of-the-ordinary things themselves to save a buck then go crying to someone else for help when they screw up or run into some type of difficulty. if you don't have the mental ability to replace a light bulb, then let someone else do it. theres no shame in asking someone else to do a repair that you have no idea how to perform. kinda reminds me of an old Polish joke.What is purpose of rubber ring on Honda Odyssey light?
condensation, it keeps moisture out, you will be replacing that bulb again fairly quick if you dont have that on there. Put a pinch of grease or oil to make it fit better. But you NEED it. cold morning, glass, heat from the high intensity bulb = condensation, condensation on hot glass = blown bulb.

Havent you ever read the box the bulb came in? "do not touch the glass part of this bulb in any way" the grease from your hands can make the bulb blow when it gets hot.What is purpose of rubber ring on Honda Odyssey light?FOR SEALING OUT MOISTURE AND VIBERATIONWhat is purpose of rubber ring on Honda Odyssey light?
the oring was installed so that the light would have a solid soft seal so that vibration want hurt the bulb ,and so that the oring would keep out any moisture are trash from intering the inside lens i would recommend installing it back on so that the inside lens do not tarnish

bubble pop