What Is a Bulkhead Fitting & What Is It Used for?

PVC Garden Hose Bulkhead Fitting With Plug, 1/2" Female NPT, 3/4" Male GHT (garden Hose Thread), For Rain Barrels, Aquariums, Sinks，6 Pack……

Installing Bulkhead Fittings

Beduan 3/4" Hose Barb Thru-Bulk Bulkhead Straight Hex Union Stainless Steel Fitting

Stainless Steel 304 Tank Bulkhead Fitting With 2 Rubber Ring,Double 1/2" Female NPT and 3/4" Male GHT (Garden Hose Threaded)

1/4" Pipe Bulkhead Fitting

Aluminum 90 Degree Elbow 6AN Male Flare Bulkhead Fuel Fitting Union Adapter with AN6 Bulkhead Nut, Black

2PCS Solid Brass Bulkhead Fitting 1/2”Female x 3/4”Male Double Threaded Bulkhead Water Tank Connector

Legines Brass Pipe Fitting, Bulkhead Coupling Tank Fitting, 3/8" NPT Female, 1.31" Length (Pack of 2)