About This Design: Plastic Hose Barb Fittings are suitable for aquariums, swimming pools, fountains, drip Irrigation, food and beverage, laboratory and chemical processing and handling, etc. Universal Compatibility for Aquatic Enthusiasts: Our fittings ensure leak-proof connections in aquarium setups, fit for standard hose sizes, making them ideal for maintaining a pristine aquatic environment. They protect your marine life's health. Specification: Material: PVC Condition: Brand New Suitable for Hose Inner Diameter:16mm / 5/8" Thread:26mm / 3/4"BSPT Package includes: 5 Pcs Plastic Hose Barb Fittings Easy Installation:Insert the Fitting, Push the hose firmly over the barb of the fitting. Start with a slight angle to ease the process, then straighten to ensure full engagement. Please Note:Remember, while the install steps are generally applicable, always consult specific instructions provided by the maker, especially for specific uses in precision or chemical environments, which may require unique considerations.