Amazon.com: 2 Pieces PVC Bulkhead Fitting for Rain Barrels, Aquariums, Water Tanks (3/4 Inch) : Pet Supplies
Brass Bulkhead Tank Fitting 1/2" Female 3/4" Male Soild Brass Water Tank Connector Garden Straight Theaded Bulkhead Fitting Tank Hose Adapter: Amazon.com: Industrial & Scientific
VEAREAR 2Pcs PVC 3/4 Inch Thread Water Tank Bulkhead Fitting Adapter with Seal Gasket - Walmart.com
Amazon.com: AC PERFORMANCE Aluminum Straight Bulkhead Fuel Fitting - 4 AN to AN4, Male to Male, Flare Union Adapter, with 4AN Bulkhead Nut, Black : Automotive
Metaland Stainless Steel 1/2" Hose Barb Bulkhead Fitting Thru-Bulk Straight Adapter for Water Fuel Air: Amazon.com: Industrial & Scientific