This is the new style nipple. The water pump tube or heater tube that runs under the manifold attaches to this new style nipple. The non PI WP nipple and tube is different and is located in the way of the new PI intake.
Fix your 44.6L cooling system correctly by taking off the water pump and intake and knocking our old fitting and correctly press fitting this new one in place. I used a socket and brass dead blow hammer.