"Stainless cylinders from RM are very good. I have used a good few as I have a lot of customers on private water supplies who get through cylinders in less than 10 years so hoping these will cope a bit longer. However, these cylinders are all 22mm connections so be aware that if you have a shower pump and 28mm cold supply to the cylinder (as you should have) then these are no good for you. I would like to see these with 1 inch connections instead of 22mm. Overall though, i'm happy with them."