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High Temp Masking Supply 3.25' x 4' Silicone Rubber Tapered Stopper Plug for Powder Coating, Custom Painting, and More

5.0 (8) Write Review
Free shipping on orders over $29.99

$9.95

$ 4 .99 $4.99

In Stock

About this item

  • Fits most common 30 oz cups and tumblers
  • Excellent for masking parts during powder coating, painting, anodizing, plating, media blasting, etc
  • Withstands heat up to 600 degrees F - Durable, flexible, rugged and reuasable - Coatings won't stick
  • Dimensions: Small end diameter = 3.25", Large end diameter = 4.00", Height = 1.50"
  • High Temp Masking Supply is a family owned, US based, small business


These high temp silicone rubber plugs are a great fit for the powder coater, custom painter, scientist, handy man, media blaster or anyone who needs premium quality plugs. While most commonly used for masking purposes during finishing, there are hundreds of other uses around the shop, home, lab, classroom, etc. This superior grade of silicone is capable of withstanding temps up to 600 degrees Fahrenheit (315 Celsius) for 20 minutes and holds up to most chemicals. It is ultra tough yet flexible, reusable and will not crack, harden, shrink or break over time. All of our premium silicone goods are color coded for ease of use and the color will never bleed or fade. This size plug is commonly used to mask most 30 ounce stainless tumbler cups to keep custom coatings from getting inside the cup itself - please measure your cup first to ensure the proper fit. Plugs can be easily drilled, cut or modified to fit finishing racks and stands.


ZSki Fpv
2025-09-03 18:57:54
So far so good. I used this to powder coat a 30oz tumbler worked great. Very good price also
John T. Horner
2025-08-22 10:36:43
I needed to replace a dried out rubber plug on my now vintage Delta woodworking dust collector and I struggled to find something the right size. Lo and behold, this high temperature capable plug is just the thing I needed. I'm hopping that the silicone material will last even longer than the original black rubber one did. So if you are looking for plugs to use with your 4" dust collection system, this is a viable choice.
Robert Russell
2025-07-10 16:56:26
Works good on cups
M. Harris-ivey
2025-06-14 17:25:52
Heavy plug, well made.
Dawn G
2025-04-23 20:57:25
I have dealt exclusively with High Temp Masking Supply for these items since I started my business, and they've NEVER let me down! Top quality products always!Jack MoyerOwner: Viper Powder Coating LLCWildwood, Florida
Swoopadoop
2025-04-15 09:21:46
This is a perfect replacement for my Built coffee cup.Not only does it seal good to keep the heat in between cups, but it also sits perfectly in my #2 cone drip filter holder to help make the paper coffee filter conform better to the cone installed the night before.
Heather
2025-04-09 12:03:11
Works great for my 30oz cups. I use this plug almost everyday. I only ordered one but going to order a few more. Thanks!
Andy
2025-01-09 15:14:18
Works well for the Ozark and Rtic 30oz tumblers for me. Haven't tried a Yeti yet, but I assume it works the same for those.