I have a 1994 Astro Van with a rectangular engine air filter housing. I am having trouble finding a replacement for the small hose that attaches to the back of the engine air filter housing. I am also having trouble identifying the name and purpose of it and where it ultimately attaches. The hose required appears to be 3/4" and currently, the previous owners has it attached to a firmer tubing of much lesser size without any reducing adapter. Any information would be most helpful. A specific part number and where to buy it would be a miracle.
