Check the listing for details. 13mm Projectile Powder Coating Paint Hose Cleaners - 500 ct. for 1/2" ID hoses. Condition: New. Listed at 12.00 USD. These 1/2" plugs are used by many powder coating firms to clean powder coating supply hoses by sending up to 3 through the hose, one at a time with air pressure. Powder Coat companies have been using our Poly Plugs by Pest Boys for hose cleaners because they are cheap, fast, and an easy to use. As an additional cost savings, we use standard USPS delivery and shipping rates. These Plugs are over sized. We recommend you order the size which is the same as the inside diameter of your hose. The 1/2" plug is actually .562 which we have custom made to fit snug into hoses or 1/2" holes. POLY PLUGS are Faster, Cheaper, and Easier to use. Poly Plugs are available for holes or hoses which are 3/8, 1/2 ,9/16 and 5/8 in diameter and 3/4" lengths and are packaged in 500 count bags. Contact us with any questions you may have, or to see if free samples are available. Poly Plugs are part of the Patented “Termiticide Flex Plug System and Method”. You can save on shipping if you order multiple bags. Additional bag shipping drops to $2.00 per bag.