Smith Equipment Torch Repair/Rebuild Parts Kit MC505, MC509 Go to amazon.com Related posts The 10 best torch kit repair for 2022 FeatureDiaphragm (9)Gasket (14)O-Ring (3 ea) (20)Seat Assembly (Entire assembly: stem & rubber seat) (16) DescriptionWarning: These parts must be installed by a qualified technician. If these parts are installed incorrectly, serious injury or death may occur.