Winter plug ekspansionsgummi ø50 mm, ekspansionsplug ø50 mm 1 1 2 to winter storage of swimming pool, winter plug to closure of returafløb past, the laws bottom drain. In unlike to vinterpropper with thread pressed ekspansionsproppen down in drain past, the laws expands themselves one bit, sa water flow closed. This text is automatic translated, past, the laws there can occur error.