on its side 70 b that snaps on to an adaptor ring 72 fig1 c referring now to fig1 c there is shown adaptor ring 72 having two sides side 72 a which connects to connector ring 70 and side 72 b the appliance connection side side 72 b connects to a dryer or other appliances described hereinbelow side 70 b of duct connector ring 70 has an annular ridge 69 matching an annular groove 71 of side 72 a of adaptor 72 so that when adaptor ring 72 and connector ring 70 are brought together they connect via a snap on connection between the annular ridge 69 and annular groove 71 side 72 a of adaptor 72 has a plurality of slits 73 allowing flexibility to side 72 a referring now to fig1 d there is shown a two piece connector 75 comprised of duct connector ring 70 and adaptor ring 72 connected to each other referring now to fig1 there is shown a dryer 78 with two piece connector 75 connected via the adaptor ring 72 to dryer exhaust port 80 and threaded on to duct 30 via the duct connector ring 70 referring now to fig1 a 16 d there is shown a lint trap 85 comprised of top part 81 and bottom part 83 having an integrally formed adaptor ring 72 including annular groove 71 on the.