Certifications and Approvals Certifications and approvals are listed here for your reference and should not be duplicated or distributed without the consent of SSP. ISO 9001:2008 Certification SSP's current ISO 9001:2008 certificate, issued by DNV ABS Product Type Approval The American Bureau of Shipping confirmation of Product Type Approval for Duolok, Unilok and Griplok tube fittings. ABS Manufacturing Assessment The American Bureau of Shipping certificate of Manufacturing Assessment for SSP instrumentation tube fittings.