a sleeve supported within said housing, said sleeve having a central opening, a plurality of peripheral grooves disposed about said central opening and {HEAD ~ a plurality} of openings peripheral to and confluent with {TAIL ~ said central opening}, 
confluent with
a sleeve supported within said housing , said sleeve having a central opening , a plurality of peripheral grooves disposed about said central opening and { HEAD ~ a plurality } of openings peripheral to and confluent with { TAIL ~ said central opening } ,
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH