Connection Size: 3/4inch female thread, perfect for 1.5inch (38mm) hole in bulkheadDURABLE MATERIAL: The clapboard fittings are made of high quality plastic that won't crack, fade or peel.EASY INSTALLATION: Choose a suitable hole about 1.5 inches for installation, assemble the tank fitting and hose fitting together.Versatile: Bulkhead Tank Fittings can be installed in rain barrels, tanks, sinks, ponds or aquariums.Colour:blackMaterial:plasticPackage Contents:5 x bulkhead adapters5 x plugs5 x ferrulesOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.