making concentric reducer is the way to cut off the expenses of the company instead we buy from maker which is expensive but we can do it onboard. By this video is very helpful for those vessel are run out of stock concentric reducer . the formula of this is in my playlist ship fitters tv..thank you...

here is the formula
   • CONCENTRIC REDUCER   6” X 5”( Emergen...  

   • HOW TO MAKE CONCENTRIC REDUCER WITHOU...  

   • CONCENTRIC REDUCER 8”x 6”  

Part 1----   • The amazing elbow was made of straigh...  

   • CONCENTRIC REDUCER 8”x 6”