HINT:
Rajesh: Howard, wait. Why don't you use this instead of the PVC to keep the transverse filter assembly in place?

Howard: Because this is not a spare part from the space station. This is the thing from the pizza box that keeps the lid from touching the cheese.

Rajesh: Is that what that's for? In India, the lid just touches the cheese. Of course, we also have rampant poverty and periodic outbreaks of cholera, so a little cardboard in our cheese is no biggie.