The installation instructions for my new refrigerator w/ ice and water dispenser call for a 1/4 inch saddle valve for water supply, but they say it can't be self tapping. Where can I get a non-self tapping saddle valve? I have looked at all of the area building centers, but they all carry the same products. I initially used a self tapper and the pressure at the dispenser is low. Thanks for any response, Benson