* PDI (Plumbing & Drainage Institute) |
|
http://www.pdionline.org/ |
*ASSE (American Society of Sanitary Engineering) |
|
http://www.asse-plumbing.org/ |
*IAPMO (International Association of Plumbing and Mechanical Officials) |
|
http://www.iapmo.org/Pages/IAPMOgroup.aspx |