| 摘要 |
PROBLEM TO BE SOLVED: To provide an air piping of a septic tank capable of preventing the generation of the erroneous connection of the air piping on an institution site. SOLUTION: Nuts 24 and 25 or sockets 5 and 6 of a plurality of connection parts 26 and 27 on the side of the septic tank to which air pipings 3, 4 outside the septic tank are connected and the vicinities of a plurality of the air discharge ports provided to an air feeder (blower) for feeding air to the septic tank are subjected to classification by color corresponding to the uses of the air pipings 3 and 4, character display at every use or both of them to connect the mutually same colors or the mutually same character displays by the air pipings.
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