Put a gasket around each connector
Offer up a section of radiator squarely then turn the 1st connector a couple of turns so that one end of the section is secure but loosely attached.
Repeat the procedure at the other end of the section. Tighten the connector a couple of turns at a time moving from one connector to the other until both are tight.
2 leg sections are normally required for a radiator upto 16 sections long, then for a 17 or 19 section radiator you will need 3 legs and for a 18 or 20 section you will need 4 legs.
The following notes are to be read before fitting your valves
When screwing the valve tail into the bush - turn it finger tight then using a spanner turn it till there is only moderate resistance. Using a 4” (100mm) spanner it is difficult to over tighten. It is easy to over tighten and crack the bush with an 8” spanner. A thread sealant must be applied to the valve tail threads to get a water tight seal. Sealants are available from your plumbers, PTFE tape is an acceptable alternative.
It should not normally be necessary to unscrew the bushes, but if for any reason you do, retighten them gently, enough only to create a good seal. 18” Stilsons should not be used! The torque from an 8” adjustable spanner is more than enough to create a good seal.
Our guide to 'Handling Your Radiator once it is built up'