The 496-5 water block element fits the 1" Goldenrod filter housing and provides superior protection from water. The element contains a water-absorbing polymer which absorbs & traps the water as it passes through the filter. As the filter reaches its capacity (approx. 1/2 cup of water) the flow of fuel is restricted - signalling that the elements needs changing. This element is also rated at 15 micron for particulate removal.