Top fittings leaked, but after i removed the two brass fittings as suggested by a previous reviewer I found the outflow labeled side actually flows to the bottom of the tank, and the other side flow from the top. The 3rd drawing on the web page shows correctly the inflow should flow to the bottom. Simply reverse the two brass fittings the leaks stopped and flow was better. The plastic lid was molded with the wrong label. Simple fix and works great.