The JTC Valve Sales has retrofit kits that include extended stems for ES8450 Series and ES9450 Series, ES8450 Series Extended Stem Standard Bonnet and 9450 series and 9460 series. These kits are manufactured by Rego and are used for converting the 9450 and 9460 series short stem valves into extended stem shut off valves. These can be converted conveniently without removing the valve from the system. These are available in two stem lengths and are cleaned and packaged per CGA G-4.1 specifications.