Tushen sanyin sanyi shine hannun rigar roba ko buɗaɗɗen ƙarewa, wanda zai iya raguwa sau uku zuwa biyar gwargwadon girmansa, kama da bututun zafi. Ana gudanar da bututun roba a wuri ta wurin ciki, filastik wanda, da zarar an cire shi, yana ba shi damar raguwa cikin girman. Ya shahara sosai a kasuwar sadarwa, da kuma a cikin masana'antar mai, makamashi, talabijin na USB, tauraron dan adam, da masana'antar WISP. Muna ba da nau'ikan bututun sanyin sanyi iri biyu, wato silicone robar sanyi tubing mai sanyi da epdm roba mai sanyin tubing.