Check the listing for details. 5 Pcs Cast Pipe Fitting Hex Locknut Nut G 1/2" Female Thread (DN15). Condition: New. Listed at 15.28 USD. Description:Product Details: screw type: G; outside diameter: 28.8mm; inner diameter:18.9mm.Enhanced Quality: The hex locknut is made of 304 stainless steel material. It is designed with a hexagonal shape for easy tightening and loosening using a wrench. The locknut also has an O-ring groove that allows for a secure and leak-resistant connection.Practical Designed to Connect: The locknut provides a secure and reliable connection in pipe fittings with G threads for creating tighter seals than straight threads. It helps prevent leakage and ensures the stability of the threaded connection.Easy to Use: To use this locknut, thread it onto the corresponding male G threaded pipe or fitting. Use a wrench to tighten it securely against the mating surface.