KOSTER NB 1 Grey has been approved for use in drinking water environments according to NSF /ANSI 61. The certification applies to contact with cold water in tanks 2000 gal or larger.
The following link will lead you to the NSF website where NSF lists the certification:
From the below link you can access KOSTER's NSF / ANSI 61 compliance certificate:
KOSTER's NSF / ANSI 61 Compliance Certification
For more information on KOSTER NB 1 Grey, visit our Product Page:
KOSTER NB 1 Grey