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The set consists of 10 blue construction plugs and 10 red construction plugs (total 20 plugs). External thread is 1/2". Plugs are made of plastic and sealing gaskets are made of elastomer. Simple installation. Plugs can be tightened and unscrewed by hand or with a wrench. These plastic plugs with sealing gaskets are used to plug water system pipes for the purpose of carrying out tightness tests of the installation when no faucets or other similar fittings are installed. Due to blue and red colour plugs, hot and cold water pipes can be immediately recognised. Gaskets ensure tightness. I provide invoices with VAT separately displayed.