ADS N-12 HP corrugated storm pipe adds AASHTO standard. ... A complete line of fittings, taps and manhole connections are available from ADS. Call (800) 821-6710, ...

The ABC voted to remove a longstanding ban on "12-6 elbows" from its unified rules, effective Nov. 1. The 12-6 elbow has been defined as a "straight up, straight down elbow strike" to a grounded ...