https://www.dillvalves.com/product_cpt/vs-902-w-performance-specialty-valve/
VS-902-W Performance/Specialty Valve - Air Control Products - Air Controls
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https://www.chemcote.com.au/preventing-hang-matcon-valve/4/
Using 500 Series in Preventing Hang Up on Matcon Valve - Chemcote Specialty Coatings
Sep 23, 2024 - Matcon Valve that has a ceramic protective coating applied. this will prevent hang up and improve efficiency. Found out how to save $$$'s Chemco Australia