Dixon Valve N Series bowes interchange pneumatic fitting. Materials: machined components are manufactured using solid steel, brass, or 303 stainless steel bar stock. Phosphor Bronze retaining ring and spring maximize corrosion resistance and extend service life. Steel componentry is plated using ROHS Compliant Trivalent Chrome. Dust cap bead chain constructed of stainless steel. Seal components: nitrile (Buna-N) pneumatically energized seals are standard, temperature range -40 degrees F to +250 degrees F.