Questions Filter Sort by: Oldest First Newest FirstRandomRecently ActiveMost VotesMost AnswersMost Viewed Ask Question Featured/Unfeatured Show featured only Resolved/Unresolved Show resolved only Open/Closed Show open questions only 1 vote 1 answer 9k views L2L Low-point drain back (trickle valve) Laundry-to-landscape systems L2L plumbing HDPE automatic drain valve Hello water wizards! I’m installing a 1″ HPDE L2L where the lowest point is sub-grade... thirstyPDX asked 9 years agolast active 9 years ago Showing 1 result