US Water carries a complete line of Stenner parts.  However, it is not prudent or cost effective to sell tiny little parts which cost more to ship than they do to buy.  Therefore, US Water has certain kits, assemblies and parts that are sold together.  Since we ship directly from Stenner on most things, there is a $75.00 minimum order of Stenner parts.  Our experience has shown us that it is generally not wise to just replace a 10 cent part that looks bad, because it's more likely other parts are bad as well.  If you have questions, do not hesitate to call one of our water experts at 800-608-USWATER or e-mail us at info@uswatersystems.com.