ISO	International Standard Organization - A worldwide standards coordinating organization. An internationally recognized certification for manufacturers that comply with high standards of quality control. Developed standards ISO-9000 through ISO-9004.
IAPMO	International Association of Plumbing & Mechanical Officials - Qualifies and lists products suitable for use in plumbing installations.
ASSE	American Society of Sanitary Engineering - Develops standards and qualifies products for plumbing and sanitary installations.
NSF	National Sanitation Foundation - A non-profit organization best known for its role in developing standards for equipment, products and services. Many standards govern products for residential use.
AGA	American Gas Association - Develops standards, tests and qualifies products used in gas lines and gas appliance installations.
CGA	Canadian Gas Association - Canadian Association that develops standards, tests and qualifies products used in gas lines and gas appliance installations.
UL	Underwriter's Laboratory - Tests and qualifies valve and fitting products under UL standards for safety.
FM	Factory Mutual - Develops standards and qualifies products for use by the general public.
AWWA	American Water Works Association - Promotes public health through improvement of the quality of water. Develops standards for valves, fittings and other equipment.
ADA	American Disability Act - Assures that products fully comply with the provisions of the act to ensure equal access for physically challenged users.
ASME	American Society of Mechanical Engineers - Develops standards for materials and testing as well as finished products.
ASTM	American Society for Testing of Materials - Develops standards for materials, products, systems and services.
ANSI	American National Standards Institute - Organization that coordinates the work amongst U.S. Standards writing groups. Works in conjunction with other groups such as ISO, ASME, ASTM, etc.
MSS	Mechanical Standardization Society of the Valve and Fittings Industry, Inc. - A committee of manufacturers that develops technical codes and standards for the Valve & Fitting industry.