... pipe Fast,Easy,Reliable flexible twin way epdm pre insulated solar hose ,Smart Design,:Twin pipe-- 2 x flexible corrugated ... material adopts 13mm& 20mm wall thickness for option, light, flexible, closed cell, synthetic caoutchouc; free of PVC and non- CFC. Material ... on the insulation pipe is with a super high density water proof polyolefin copolymer jacketing. have excellent performance of UV- ...