IKEA sink strainer

So I bought a IKEA Fyndig (http://www.ikea.com/us/en/catalog/products/S69158007/) for my outdoor bbq but didn't see the point in buing the full kit with the plumbing parts etc.

The big diameter is 115mm since thats the size of the original part, the lower part is made to fit within a 50mm sewer pipe. Screw them together with a M5 screw and nut.