Features: 1.The metal material ensures the stability of the product 2.Comes with a gasket with high elasticity for better sealing property 3.Can be used for CO2 regulator at the aquarium or fish tank 4.Easy to install and convert, no high installation skill required 5.Brand new and high quality, it is durable enough for long time use Specification: Features: 1. The metal material ensures the stability of the product. 2. Comes with a gasket with high elasticity for better sealing property. 3. Can be used for CO2 regulator at the aquarium or fish tank. 4. Easy to install and convert, no high installation skill required. 5. Brand new and high quality, it is durable enough for long time use. Specification: Condition: 100% Brand New Material: Metal Color: Silver Type: (optional) #1: Internal Thread G5/8 to External Thread W21.8 #2: Internal Thread W21.8 to External Thread G5/8 Length: Approx. 3.7cm / 1.5in Weight: Approx. 70.8-81g Package list: 1 * Aquarium Connector Adapter 1 * Gasket