<Specifications> ●Waterproof performance test value (smooth inner pipe) 0.1MPa × 72 hours (This product does not guarantee complete waterproofing.) ●Composition ・Sleeve material: Rigid polyvinyl chloride pipe (JIS K 6741) VU or VP ・Sleeve penetration pipe: Underground buried electric wire protection pipe, Furukawa Electric Co., Ltd. Eflex (or flame-retardant Eflex) ・Sealing material: Curing waterproof material filled in 2 locations ↓↓↓↓↓↓■Why is the waterproof performance of the pipe-in-sleeve set to "3 days"?■↓↓↓↓↓↓ ◆Municipalities state that "the depth of flooding due to floods is 1 to 3 meters, and the duration of flooding is generally half a day to 1 day, but in some locations, it may be 1 to 3 days." ◆Emergency power generation equipment in hospitals and similar facilities is recommended to operate continuously for "more than 72 hours (3 days)" according to laws and guidelines. ◆The time until the restoration of lifelines during disasters and the supply of relief materials is assumed to be 72 hours. ◆Time limit for rescue activities: The time during which the survival rate is said to drop sharply for rescues from collapsed buildings is within "72 hours (the golden 72 hours)."

PIS

*R2.6 Publication of the National Transportation Agency "Guidelines for Flood Prevention Measures for Electrical Equipment in Buildings" *R3.4 (Public Interest Incorporated Foundation) Japan Sewerage New Technology Organization "Promotion of Waterproofing (Final Version)" The adoption of ●● cast iron pipes is rapidly increasing in the related construction work! <Public Works / Adoption Records Excerpt> (Statistics from January to June 2026) - Osaka Prefecture ●● City) Construction of communication facilities, etc., due to expansion of ●● and others - Shizuoka Prefecture ●● City) Electrical equipment construction for ●● District Center in fiscal year 7 - Kyoto Prefecture ●● City) Electrical equipment construction related to the new building of ●● City Hospital (Section 1) - Kanagawa Prefecture ●● City) Electrical equipment construction for the expansion of ●● Elementary School building No. 1 - ●● Prefecture Civil Engineering Department Maintenance Division) Electrical equipment construction for the new construction of (tentative name) ●● Special Support School - Aichi Prefecture ●● City) Integrated redevelopment project for ●● City School Lunch Center (For other records, please download the separate adoption record sheet) Due to the recent shortage of construction workers and skilled labor, while "easy construction" is possible, there are also materials/methods that underestimate waterproof performance, leading to an increasing trend in water leakage issues at power supply entry points in recent years. To prevent water leakage accidents that could lead to large-scale repair work later on, we advocate for the adoption of pipe-in-sleeve systems that combine both "labor-saving at construction sites" and "maintaining the waterproof performance of buildings."