Finish TradesCâu 267 / 700
A new landscape irrigation system connects to the potable water supply. To protect drinking water from contamination, the system must include:
a.A larger meter only
b.An approved backflow prevention device
c.A pressure gauge only
d.A drip line with no valves
Giải thích
Irrigation connected to potable water must have an approved backflow preventer (such as an atmospheric or pressure vacuum breaker or RPZ) so fertilizer- and soil-contaminated water cannot siphon back into the drinking supply. A bigger meter, a pressure gauge, or valveless drip lines do not provide backflow protection.
Luyện miễn phí toàn bộ 700 câu hỏi — không cần đăng ký.
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