Package include: 2 x 1.9cm PVC bulkhead fittings for rain barrels, water tanks or aquariums, they are good tools Size: Inner hole: approx. DN20 (3/4"), inner hole size: approx. 24.3 mm, cap thickness: approx. 11 mm, outer thread diameter: approx. 37.8 mm, total height of the interface: approx. 47 mm, depth of the external thread thickness: approx. 38.5 mm, plastic ring thickness: approx. 3.5 mm Function: The lock nut is reverse threaded, the bulkhead fitting with 4mm thick silicone gasket that conforms to the shape of round barrels. Easy to install: drill a 4.5cm hole to install the bulkhead fitting adapter with durable silicone gasket that will seal the watertight. Widely Used: Water hose connector applicable for durable commercial plumbing, aquariums, reef tanks, irrigation, swimming pools and water parks. 2-Pack 3/4" PVC Plastic Water Tank Fitting Features: Made of PVC plastic, won’t fade, crack or peel, durable and long lasting. The locking nut is reverse threaded, the bulkhead