NPT adaptors are commonly used on our systems to bridge the connection between the bypass assembly and your home plumbing lines.
NPT fittings are listed by the "standard" inner diameter (I.D.) of the fitting. They can be found at most hardware stores. Below is a photo example of a 3/4" to 1" NPT adaptor. Note: The adaptor you will need may differ from the pictured example, depending on your type of piping.