MJ Grey Mechanical Couplings A game changer that is taking PVC DWV to new heightsIPEX is proud to bring more jobsite relief to your crew by introducing MJ GreyTM&n...	Home  | Training  | Online Solvent Cement Training Course  | Online Training Registration Click on the "Next" button to complete our registry form. PLEASE NOTE: Once you have successfully completed the online training course, a certificate of completion will be mailed to you within 4-6 weeks. Log in using your email address.