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