... 4.5 meters, pipe size for the 8 * 6mm, 8-hole / 10 hole product features: smooth surface, feel good, the surface without impurities ... RUBBER ROPE, or 8tube solar collector (8-hole solar collector) or 10tube solar collector (10-hole solar collector) outside on the roof used ... to heat swimming Duo water equipment, specifications do now eight holes and 10 ...