Instead of unions I use sections of straight auto radiator hose and clamps. Stuff it reinforced to handle the pressure and temperature is not an issue. An added benefit is it allows the joints to move a little thus reducing stress on the pipes and joints and cuts noise by isolating the pump noise somewhat. You can make the sections as long or short as you want. If you make them real short the hose tends to stick to the pipe after time and can be a little difficult to remove. To 'crack' the hose loose I use a big pair of channel lock pliers for a better grip to twist the hose. Once loose it will slide on the pipe for removal. The pic shows joints for the valve but I have them on the pump ins and outs too. Hose can be kind of pricey but the cheapest stuff you can find will work fine. Compared to the underhood environment this application is nothing and the cheapest stuff holds up extremely well. If I recall, you can expect to pay about $20 for a 3' section.
Al
http://www.poolforum.com/pf2/attachm...5&d=1144256085

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