Response to My relief valve is dripping. I have a Purex-Triton Filter model #CC100.. Design flow=100 g.p.m. and 6.5 psi residential. There is a pin number on the tank housing =178555..Do I need to purchase the entire relief valve OR the very small "O" rings inside the valve? I have had this unit since 2000. I do not know if this assembly 998209800 is the correct fit But it sure looks like it! Thanks

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