C9 Rubber O-Rings, White, 100-count

C9 Rubber O-Rings, White, 100-count


Regular price$13.82
Shipping calculated at checkout.

  • In stock, ready to ship
  • Inventory on the way

Help protect your lights from moisture. These o-rings are designed primarily to be used in conjunction with LED retrofit bulbs installed in standard, traditional Christmas light cord. Snugging in around their narrower bases, these rings improve your light string's water resistance.

Sold in a package of 100 o-rings.

Place the ring around the base of the bulb. Then screw the bulb into the socket.

Make sure to fully tighten down your bulbs to ensure electrical contact between the bulb and C9 socket.


Please test your lights when you receive them! Everyone is happier when we resolve issues quickly.

Our warranty for all our products is 90 days of normal, seasonal use. If a product is defective or fails during the 90 days following receipt of your order, please contact us right away by replying to your order confirmation email. Please include photos of the issue and a photo of your product item number, if applicable. We will work with you to troubleshoot the problem, and if the issue is not easily and quickly resolved, we will correct the situation.

See our Warranty Policy Page for more information. 


Orders are shipped Monday - Friday. During this peak season, orders are leaving the warehouse in 1-2 business days. We are doing everything we can to process and ship orders as quickly as we can.

Orders are not shipped during the weekend or on major holidays.

See our Shipping Information Page for more information.


Like-new, uninstalled products may be returned for a credit to the form of payment used during checkout. Please reach out to us to request return instructions. Reply to your order confirmation email us via our contact page. Orders must be returned within 30 days of requesting return instructions. After receipt of the return, the amount of the purchase price should be credited within 7 business days.

Return and original shipping charges are not refunded.

See our complete Returns Policy.

Specifications and Dimensions

Material Rubber
Width 1 1/8"
Height 3/8"
Usage Indoor/Outdoor
Quantity 100
Purpose / Uses Provides Extra Watertight Protection Between Bulb and Socket
Bulb Type Accessory to C9 (Intermediate) Sockets
Ring Specification Flexible Rubber Ring Snugly Fits Onto Rim of Socket between the Bulb and Socket to Provide a Weatherproof Seal.

For CA Residents: Prop 65 Notice

Questions and Answers

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  • Are these washers heat resistant enough to use with vintage incandescent C9 outdoor Christmas lights? What type of rubber are they made from? Thanks.

    Yes. People have been using these on incandescent bulbs for years.

Customer Reviews

Based on 8 reviews
Thomas M. (Pinellas Park, FL)
1st time using

The o rings went on nice & seems to be sealed properly
Will see how they do when it rains

M.A. (Gallatin, TN)
Excellent seals!!

These are pretty nice little seals that will keep water out of the sockets and help insure a good connection for the bulbs. Nobody wants to go changing bulbs or sockets in the middle of the holiday season!!! I saw where there was an issue with these being a little hard to install, but here's my personal experience with these. The sockets I'm using are not the best. The bulbs don't get snug until the very last moment and tend to cross thread way too many times. I have to back them out and intentionally screw them in straight even though it may want to cross thread again. That said, these made the bulb installation even harder and I was not at all confident of a solid connection inside the socket since these tended to hinder the bulb being screwed into the socket. So... I went to my toolbox and took a 5/8" deep socket to use on these o rings. I placed the o ring on the bulb thread as usual and then used the 5/8" deep socket to finish pushing the o ring completely on to the bulb to the point where it would actually flare on the base of the bulb. It didn't take any pressure to speak of to do this, but made all the difference for me when screwing the bulb onto the C9 socket. No resistance at all and a nice tight seal in the end. This ultimately produced results much better than relying on the bulb to fully mate with the socket. For my purposes, I would only use these if installing bulbs in an upright position, not upside down... no need for it then and could actually hold water instead. In short, they are a good investment for my hard work on customizing my light display and would recommend them. I wish I could have found some of these in brown, but the black will do. Not as noticeable as a thought they would be on brown light strings. Start early. Patience and planning will pay off in the long run!!!

Terry D. (Tinley Park, IL)

O-rings went on nice and easy with the C9 bulbs I purchased. Hopefully a little extra protection for the weather.

James S.
Added Protection

Just installed these rubber o-rings onto our new light strings. They provide a great seal at the bottom of the bulb where it meets the socket. With the occasional tropical downpours here in Florida, I am confident this added protection will keep our lights "happy" for years to come.

Jon S.
Perfect product!

I wish I had found these years ago, before corrosion made me replace all of the sockets on the luminarias we put up for Christmas! These little live rubber donuts seal perfectly between the bulb and the socket. My only regrets -- I only needed 22 but had to buy 100, and had to pay a warehouse charge that was more than the price of the items.

Great Idea

I installed almost 500 LED bulbs on my most recent project with these little beauties and consider them an essential part of the entire investment. If you're buying cord sets and installing your own bulbs I'm not sure there is a better way of weather proofing your light sets and protecting your investment especially if you're spending extra for LED bulbs. The O-ring seals the bulb and socket very well. Be sure to get your bulbs in good and snug. If you don't get them turned in good and tight the bulb may not light. It's very easy to check with the light set on the ground and get them in all snug. I suggest lighting it all up on the ground before heading up the ladder.

Mike M.
C9 Rubber O-ring

Purchased more rubber O-rings because they did a great job of keeping the snow out of the sockets which would cause them to crack and break without them.

Paul C.
Get these and save your lights and light strings

These O-rings are like the one that used to be on our old lights. They made our lights last much longer because the water stayed out of the socket. It also made sure the socket was less likely to rust out. Well worth the purchase and the effort to install - which is not much more than slipping it on the base of the light and screwing the light in. The nice thing is they also help keep the lights in the socket they don't start turning, because the o ring help keep the light tight in the socket. Get these

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