PVC-U ball valve 50 mm glue socket 16bar DN40 grey type AK. Installation instructions according to § 13 NAV. Please note that appliances with a connected load of 230V are supplied with a safety plug or a fixed connection (without plug), depending on the power rating. If the appliance has a fixed connection, a specialised company must be commissioned with the installation. All appliances with a connected load of 400V or more must be operated via a suitable power connection and may only be connected by a qualified electrician. For appliances with a rated output of more than 12KW, the approval of your network operator is required. Please contact the grid operator or an installation company listed in the grid operator's register of installers before installation. Such an installation company will help you to obtain the necessary authorisation from the respective grid operator.