SOL50LF1S Sterling Lead Free Solder Lead-free solder widely used in plumbing applications where lead-bearing solders are prohibited. Contains nickel, making joints tremendously strong. Wide range makes Bridgit an excellent alloy for large diameter fittings and ill-fitted or non-concentric pipes. Fills gaps and caps off easily and effectively.Conforms to 1986Safe Drinking ActNSF/ANSI 61, NSF 51B32 Grade HBAnnex G/California AB 1953