Www.aces.edu/dept/fisheries/education/documents/barrel-ponics.pdf. 55 Gallon Plastic Drums. An Improvised PVC Bulkhead Fitting for Liquid Storage Tanks. An Improvised PVC Bulkhead Fitting for Liquid Storage Tanks RuggedCompatible with and Inert to Most ChemicalsImpervious to WeatherMade from Common HardwareVery 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. Aquaponic Links.