Register Plates & Sealing Chimneys Register Plates & Sealing Chimneys Bespoke Register plates We make register plates from rust proof galvanised plate steel on site to ensure a perfect fit. 54155157 Custom Made & Insulated They are insulated above with a heat resistant insulation to prevent any heat escaping up the chimney. 54155159 The top of an open chimney is sealed and capped. Pots are used with 'chapeau's' to prevent rain entering and a tell tale mushroom indicates if the flue liner is correctly sealed. 54155158 Hunter 8 Woodburner Installation Under the chimney pictured above! 54155000 Chimney top before a pot is fitted & sealing 96296926 Same chimney afterwards 96296928 Same chimney different angle 96296927