Water Supply & DistributionQuestion 48 of 120
Which copper tube designation has the heaviest wall thickness and is the type commonly required for an underground water service?
a.Type M
b.Type L
c.Type K
d.Type DWV
Explanation
Wall thickness runs K heaviest, then L, then M, so Type K is specified where the tube is buried and exposed to soil and backfill loading. Type L is the common choice for interior water distribution and Type M is the thinnest pressure type, often restricted to above-ground use. Type DWV is not a pressure-rated water tube at all and is limited to drain, waste, and vent service.
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