This brand new NOS Collar assembly is used to mount any wet or dry nitrous Nozzle with the standard 1/16 NPT body threads anywhere you can't or don't want to tap threads for the nozzle.  Common application is for the air inlet duct or air box that can't be tapped.   Fixed shipping of $3.00.    See my other auction items for more good deals on nitrous and hot rod parts-------------you may also call the shop at 702-596-2616 with questions.   PLEASE BUY WITH CONFIDENCE;     MY FEEDBACK IS ALL FROM BUYERS!       CHECK WHAT THEY SAY ABOUT MY SAME DAY SHIPPING WITH TRACKING!