HI I AM MOVING MY FLUE FROM VERTICAL TO HORIZONTIAL I BOUGHT 2 90DEG BENDS 1 EXTENSION 750 AND A VERTICAL FLUE KIT AS PER W/BOSCH WEB SITE
THERE ARE NO INSTRUCTIONS ONLY SCREWS DO I NEED TO PUT RUBBER SILCONE ON THE JOINTS AND ARE THE SCREWS SELFTAPERS THE BOILERS LESS THAM A YEAR
THANKS JD