Looking for a plug that will mask internal threads AND the first / lead-in thread during powder coating, ecoating, etc.? Check out these first thread plugs.
The Ultimate Guide to Caps and Plugs
Push-In Bevel Plugs CP Series
Masking Plugs - Daemar Inc
Plumbing Plumber White 17mm Width PTFE Thread Seal Tape
Silicone Rubber Plugs for Powder Coating Masking - Custom
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Masking Plugs & Caps for Powder Coating - Custom Fabricating
Product Line - Masking Products - Masking Plugs - Silicone Blind
High Temperature Caps & Plugs for Masking, Buy Online
Echo Engineering and Production Supplies, Inc
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