I roto i te ao hoahoa mīhini, ko te hononga me te tautoko te mea nui hei whakatutuki i te pumau me te mahi a te hanganga. He hononga noa ngā horoi tīwiri (e mōhiotia ana ko ngā gaskets). Ahakoa he iti, he mahi nui tā rātou i roto i te huihuinga mīhini. Ka tūhuratia e tēnei tuhinga te hiranga o ngā horoi tīwiri, ka tātarihia ō rātou mahi, ngā momo, me te hiranga i roto i ngā tono mahi.