Watch Ask This Old House online: Episode 23 Clearing a Clogged Vent Stack; What Is It?; Building a Backyard Ice Rink

Richard helps homeowner Tom Pulkowski of Chelmsford, Massachusetts clear a clogged vent stack with the aid of a fiberoptic plumbing snake. Then Richard, Roger, Tom and Kevin ask, ""What Is It?"" Then Roger helps homeowner Dennis Cronin of Duxbury, Massachusetts build an ice skating rink in his backyard. More Info & Resources

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