3351-0015 is used on Hypro Nylon Line Strainers with 1/2", and 3/4" threads. White bowl also available, use part number 3351-0005.
I love the clear bowls, they do crack if over tightened, recommend keeping a spare, also so a skate O-ring for when it gets thrown out wile dumping cup / cleaning strainer. Use a little lube (dish soap works well) when Hand tightening for no leaks while not over tightening.
Thanks for sharing a tip!