Preferably, {HEAD ~ a groove} is configured in a top surface of {TAIL ~ the cooling tube} 554 adjacent the porous insert 552 for retaining an end seal 104 as previously described 
Preferably , { HEAD ~ a groove } is configured in a top surface of { TAIL ~ the cooling tube } 554 adjacent the porous insert 552 for retaining an end seal 104 as previously described
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH