When I replumbed my system I decided against unions because of their cost and I wanted something flexible to reduce stress on pipes and fittings and cut down on noise. Wound up with sections of straight auto radiator hose of the right size slipped over the PVC pipes and held with hose clamps. You can get 3 foot sections in almost any auto store. Go for the cheaper stuff, you don't need the super reinforced high cost hose. Should be about $20 per 3' section or thereabouts. Mine have been in place for probably 5-6 seasons now and show very little sign of deterioration.
Al
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