If. it is leaking where the pvc connects to the cast.
first...with a knife to scrape with
verify that the connection is lead.
if it is lead, grab a hammer and a dull chisel, pound the lead some more
if it is not lead
remove band, remove the pvc pipe from the cast
go to a plumbing supply house, NOT A HARDWARE STORE
and buy a EZTITE hub gasket ACCEPT no OTHER
EZTITE GOT IT ???
get the smallest can of BLACK SWAN lube and a couple of 1'' paint brushes
schlep that **** back to the house
clean the hub where the pvc was. paint the inside of the hub with the black swan
insert gasket..might have to tap it with a hammer
paint the gasket with black swan
BEVEL the end of the pvc pipe, If you do not, you are in for a fight
paint the pipe with blak swan
push, turn, wiggle up and down, the pipe into the gasket till it bottoms out
opps...bevel it some more not enough
try again.
replace the band