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https://plasticalfa.it/wp-content/uploads/2022/09/tappo_PN4_plastica-alfa.jpg500500PN4 plug with clamping nuts. These low-pressure fittings are the ideal solution for agricultural and residential irrigation systems. They find wide application and are characterised by their ease of installation and assembly. Made of plastic, they are PN4 fittings ideal for professionals and hobbyists.