If you're looking for a NPT brass fittings then Amazon is a good choice. From American Standard the NPT Vacuum Breaker is compataible with all personal showers and prevents back flow of water into piping. Functional and easy to use the NPT brass fittings install easily. American Standard 1660.400.099 In-Line 1/2-Inch NPT Vacuum Breaker, Polished Brass
American Standard 1660.400.099 In-Line Vacuum Breaker, Polished BrassAmerican Standard 1660.400.099 In-Line Vacuum Breaker, Polished Brass Features:; Installs between any wall supply and flexible hose on hand-held shower. ; Prevents back flow of water into supply piping (May be required by code in some states); Compatible with all Personal Showers; Limited Lifetime Warranty - Function & Finish 
the npt brass fitting is found at amazon.com
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