Waterway O-Ring [#133 Gunite] is a genuine Waterway Plastics replacement part used for helping seal compatible Waterway components against leaks and pressure loss. This component is intended for pool and spa service work where the original part is worn, damaged, missing, or no longer sealing or operating as intended.Choosing the correct Waterway replacement part helps maintain proper fit, flow, and equipment performance without unnecessary modification. Because many plumbing, jet, skimmer, valve, and control components look similar across model families, always compare the part number, connection style, color, dimensions, and equipment model before ordering. Helps restore a tight seal in compatible assemblies Useful for routine maintenance and leak repair Replaces worn, flattened, or cracked sealing rings Supports dependable service of Waterway components Part number and size help verify correct fit Part number 805-0133B is a helpful reference for confirming compatibility with the existing Waterway assembly. For best results, install according to the equipment manufacturer’s service guidelines and replace related gaskets, seals, or hardware when needed.