Oatey® No. 5 Paste Flux is a petrolatum-based flux designed to provide superior wetting properties for better solder flow. It can be used with most soft solders, 100% lead-free and safe for use on potable water applications. No. 5 Paste Flux's formula prevents copper piping turning green and is excellent for large diameter copper pipe applications. Oatey products have earned the trust of plumbing professionals for over 100 years.

• Petrolatum-based solder paste flux
• 100% lead-free paste cleans and fluxes copper piping
• Effective on all metals except aluminum and stainless steel
• Ideal for large diameter copper piping
• Petroleum base provides cleaning effectiveness
• Will not turn copper piping green
• Compatible with all common plumbing solder alloys
• Material is safe for use in drinking water applications
• NSF standard 14 (performance) and standard 61 (health effects) certified
• Excellent wetting characteristics for better solder flow and exceptional bonding
• 1 lb.