When sourcing for B2B applications, prioritize Lead-Free Brass (H59 or H62) as the primary body material due to its superior corrosion resistance and antimicrobial properties. For high-end projects, 304 Stainless Steel is an excellent alternative as it is rust-proof and lead-free. Avoid low-cost zinc alloys for internal components, as they are prone to corrosion and leakage over time. Ensure the surface finish (Chrome, PVD, or Electroplating) passes a 24-hour Acid Salt Spray Test to guarantee it won't peel or tarnish in humid environments.