HDPE or High-Density Polyethylene is plastic gas line made for gas use underground. CTS or Copper Tube Size is gas line made to control the outside dimensions (OD) to be the same as copper tube piping.
That means that 1" CTS pipe has an OD of 1 1/8" and 1 1/4 CTS pipe has an OD of 1 3/8". When you order gas line or are connecting up to existing gas line, make sure you use CTS connections for CTS sized gas line. IPS or Iron Pipe Size do not work on CTS sized tubing.
You must match CTS sized gasline with CTS fittings.
Carefully observe pressure rating of equipment.
Our gas line meets ASTM D2513 specifications and is manufactured in the U.S.A. by Oil Creek Plastics. Yellow tubing is PE-2708; black-with-yellow-stripe (1¼" cts) is PE-4710.
Plastic must be buried or protected from sunlight, weather and physical damage. Plastic gas line is used for outside underground service line to your house or building. Use only metal fuel gas piping indoors.
sdr = standard dimensional ratio.
cts = copper tubing size.