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Most of my old radiators have inner plastic tubes (c. 10-15 cm length) inside them connecting them to the TRV; how essential is it to re-insert these when re-connecting a radiator (having been power-hosed once removed to remove gunge build-up) and can they be replaced ? if so, what are they...

Most of my radiators are old and they each have two pipes into the TRV rather than one; as most of the B&Q/Homebase-type replacement TRVs only seem to cater for single pipe inputs to them.... (i) can mine be converted to accommodate single pipe input :?: ; (ii) if so, where can I get these...