Check the listing for details. 2Pcs Cast Pipe Fitting Hex Locknut Nut 1 1/2" Female Thread DN40. Condition: New. Listed at 14.16 USD. Description:Product Details: screw type: PT; outside diameter: 58.6mm; inner diameter:45.6mm.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 PT 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 PT threaded pipe or fitting. Use a wrench to tighten it securely against the mating surface.