How to join two cast iron radiator sections together
So you've taken your time, browsed our site and decided which cast iron radiator you want. You've also decided on what size it should be and what your ideal finish is, but is there anything further to consider?
It should be noted that if a cast iron radiator is ordered in a size longer than 1200mm, it will overhang a pallet and will need sending in two blocks. These two blocks will then need to be joined together on site.
Cast iron radiators are also very heavy, meaning in order to be able to carry them, they need to be in manageable sized sections. So if you are ordering radiators with a length over 1200mm, it is highly likely that the radiator will be sent in two sections. You should ask your plumber if they have a joining tool, which most will have, although if they don't, you can buy one on a sale or return basis in the accessory section of our website:
For details on how to join the radiator please follow the below instructions:
1. In one end of the radiator screw a pair of nipples in 1 turn and place a gasket over (do not use any jointing paste or tape). The nipples are the chunky cylindrical steel components shown on the floor in the first picture below.
2. Line up the other section of the radiator with the nipples making sure the thread orientations are correct.
3. Hold the joining tool over the section of the radiator, you are looking to attach and mark the key at the point where it will engage with the internal lugs inside of the nipples.
4. Insert the joining tool into the radiator to the mark (so it is engaged with the internal lugs of the nipple) and rotate the nipple 1 turn so it pulls the two radiator sections together.
5. Repeat this operation with the other nipple again only using 1 turn, then switch back to the other nipple. Continue this process ensuring the two sections are kept parallel and are pulling together without too much force.
6. Once the two sections are tight together, it is recommended a tightening torque of 200 Nm (20 kgf-m, 150 lbf-ft) to compress the gaskets and create a water tight seal.
Article by Benjamin Clarke