Features: Universal for most rain barrels water tanks ponds or aquariums Will not fade crack or peel durable and longer lasting ABS versus standard plastic bulkhead fittings Easy to install drill hole to install assemble the bulkhead and hose adapter together commercial and industrial use Locking nut is reversed threaded; The bulkhead fitting with thick rubber gasket to the shape of the round barrels maintain your barrel with fresh new rain water season after season Specifications: Type: 1 2 3 Material: ABS Color: White Size: 1: Inner Hole: About DN15 (1/2 ') Internal Thread Diameter: About 20mm External Thread Diameter: About 28mm Total Height Of Interface: About 26mm(include the outer disk) External Thread Depth: About 20mm(not include the outer disk) Rubber Gasket Thickness: About 3mm 2: Inner Hole: About DN18(3/4'） Internal Thread Diameter: About 25.2mm External Thread Diameter: About 35mm Total Height Of Interface: About 31mm(include the outer disk) External Thread Depth: About 25mm(not include the outer disk) Cap Thickness: About 10mm Rubber Gasket Thickness: About 4mm 3: Inner Hole: About DN25(1'） Internal Thread Diameter: About 31mm External Thread Diameter: About 45mm Total Height Of Interface: About 44.5mm(include the outer disk) External Thread Depth: About 33.5mm(not include the outer disk) Cap Thickness: About 11mm Package Included: 2pcs x Water Tank Connector(without plug) Note: 1. Due to the light and screen difference the item's color may be slightly different from the pictures. 2. Please allow 0.5-2 cm differences due to manual measurement.