Harley Davidson Original OEM Fuel Strainer Top.Part # 3614-39.Fits Big Twin Knucklehead Models 1939-41.Fits 1941 WLA Models.I put used in the description,but it may just be cosmolene coated and some dust and dirt.Any way you look at it,this unit is in great condition.Yes it needs a good cleaning and the threads look fine.As always,Please look at all pics so you know condition,(see all pics).Good luck bidding.Thanks for looking.