Amazon.com: FVIEXE 10PCS 1 Inch PVC Bulkhead Fitting, Double Threaded Bulkhead Water Tank Connector for Rain Barrels, Aquariums, Water Tanks : Industrial & Scientific
Parts: Bulkhead Fittings - 2-Pack – WaterPrepared
SPEARS, PVC Body, 3 in Female NPT Inside Connection, Bulkhead Tank Fitting - 3FMY8|8172-030 - Grainger
Everbilt 3/4 in. Polyoxymethylene Bulkhead Union With Washer Fitting 800479 - The Home Depot