Specifications: The bulkhead fitting adapter is suitable for sealing the openings of water towers, water tank, external pipes, valves, faucets, etc It comes with clear silicone seal gasket which has greater sealing performance. This fitting adapter is not easy to fade and durable in use since it is made of high quality PVC. Item Name: Bulkhead Fitting Adapter Material: PVC Quantity: 2Pcs Features: 3/4 Inch, with Seal Gasket, Durable Size Details: Inner Hole: DN20 (3/4") Inner Hole Size: 24.3mm/0.96" (Approx.) External Thread Diameter: 37.8mm/1.49" (Approx.) External Thread Depth: 38.5mm/1.52" (Approx.) Total Height of Interface: 47mm/1.85" (Approx.) Cap Thickness: 11mm/0.43" (Approx.) Silicone Ring Thickness: 3.5mm/0.14" (Approx.) Notes: Due to the light and screen setting difference, the items color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 2 x Bulkhead Fitting Adapter (Plug Not Included)