Product Focus: Radiant Heating Systems Issue: 9/01 Vanguard Piping Systems Inc. offers a full line of hydronic radiant tubing and accessories, including design software, manifolds, controls and installation accessories. Vanguard's plastic and brass manifolds are completely modular, allowing you flexibility of design and installation for an economical price. Vanguard offers both oxygen barrier and non-barrier PEX tubing in coil lengths of up to 1,200 feet. Vanguard Piping Systems Inc.