The invention relates to apparatus for connecting {HEAD ~ a radiator} to {TAIL ~ a single or double tube type hot water central heating system} 
to
The invention relates to apparatus for connecting { HEAD ~ a radiator } to { TAIL ~ a single or double tube type hot water central heating system }
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL