1/2" x 300 Ft ALPHA PEX-A Expansion Tubing O2 Barrier Radiant/Potable
(for Radiant Heating and Potable Water). Alpha PEX-A Tubing by PEX GUY. This material is rated for direct burial and poured concrete installations. 1/2" x 300 ft Red Alpha PEX-A Expansion Tubing with Oxygen Barrier.