Recently I acquired one of these coolers for a mash tun and would like to put a valve on it. Ive measured the thickness of the wall and it looks like a 2 inch nipple would be the way to go. The hole with the factory plug pulled out is 1inch in diameter and on the valve kit page it says its meant for holes no larger than 7/8inch. Can you reuse the plastic drain pipe insert? Its about 1/2inch in diameter. Any info would be appreciated. Thanks.