The Problem with Standard Hose Cleaners If you’re using 1/2" diameter foam plugs to clean your 3/8" diameter hose, or 5/8" plugs to clean a 1/2" diameter line, you might feel frustrated. The plugs often fit too tightly. This can make the cleaning process tedious and time-consuming. You might want to consider trying the Poly Plugs by Pest Boys. Here’s why they could be the solution you need. The Poly Plugs are designed with a maximum size increase of just 10% over the standard