Hiki iā mākou ke hana i nā ʻano like ʻole o ka plastic manhole step, loaʻa iā mākou nā pae piha o nā ʻanuʻu, e like me ka hao, Carbon steel, stainless steel, aluminika a me ka plastic encapsulated.
Hiki iā mākou ke hoʻomohala i nā manaʻo hou me ke kiʻi a i ʻole ka laʻana a ka mea kūʻai aku.
Loaʻa ka ʻike hou aku ma ka loaʻa ʻana o kāu nīnau.
1) DIN19555/EN13101
2) BS1247