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An Improvised PVC Bulkhead Fitting for Liquid Storage Tanks Rugged Compatible with and Inert to Most Chemicals Impervious to Weather Made from Common Hardware Very Inexpensive A "bulkhead fitting" is an unusual item of plumbing designed to pass a connection through the sealed wall of a vessel. While there are a lot of household and industrial applications for them, you won't find bulkhead fittings at Home Depot.
1. Barrel-ponics Early system build details for using plastic barrels. Good for background, info and techniques is dated.