| 4-point nipple on the outside, 4-point nipple on the inside, 4/ 6 standard pacifiers, straight-through pacifier, multi-functional turning 4 points, 4 points for water flow, 4 points for repair, 4 points for inner standard connection, 4 points for direct outer wire, 4 points for direct inner and outer wire, 4 points for outer wire elbow, 4 points Divided into inner and outer wire elbows, external 4-point to 20-point geothermal pipe joint, 6-point to 4-point diameter reduction, 1 |
