GM type well hole steel grating auwai uhi: hoʻohana nui ʻia i loko o nā pūnāwai wai, nā pūnāwai one, nā pūnāwai wai, nā pūnāwai a me nā lako wai ʻē aʻe a me nā pūnāwai hoʻoheheʻe a i ʻole nā uhi no nā lua ea a me nā manholes ma nā hale aupuni e like me nā alanui a me nā paka.Hiki ke hoʻolālā ʻia ka uhi paʻi kila puka lua GM e like me ke ʻano flip-up, a ʻo ka wehe ʻana a me ka pani ʻana o ka huli ʻana he 110°.ʻAʻole wale ka pale ʻana i ka ʻaihue i ka uhi ʻana i ke kila me ka pin hinge akā maʻalahi hoʻi i ke kaʻina hana.