ʻO ka mea non-metallic i loko o ka mea gasket he mea palupalu maʻamau, a ʻo kona ʻano he pōʻai mua. He mea paʻakikī ke ʻoki me ka lima, a haʻahaʻa ka puka. No ka hoʻomaikaʻi ʻana i ka nui o ka hana a me ka maikaʻi, pono ia e hoʻokomo i nā mea ʻoki ʻoki.