That's the spool valve assembly. There's a gasket between it and the block. Plus an o-ring around the oil pressure sender.
http://www.hondaautomotiveparts.com...tcgry4=KA5AT&catcgry5=OIL+PUMP+-+OIL+STRAINER
Your mechanic can remove that and replace them.
But first, check under the oil filter to make sure there's only one gasket there. Sometimes they stick during an oil change and you can end up with two, and it'll leak.
Chip H.
http://www.hondaautomotiveparts.com...tcgry4=KA5AT&catcgry5=OIL+PUMP+-+OIL+STRAINER
Your mechanic can remove that and replace them.
But first, check under the oil filter to make sure there's only one gasket there. Sometimes they stick during an oil change and you can end up with two, and it'll leak.
Chip H.