There are 2 pieces of foam on the main hose from the manifold to the POA valve. Mine measure 4-3/4 but they were most likely 5". From the bell on the manifold it's 18" to the first one. There is 6" between the 2. I purchased part number 15190971 GM from Ebay. Not possitive if it will work but it was cheap. Like 5 bucks. I can take pictures if you need....Joe