What do ductile iron pipes need to connect with three? Can I contact it directly?
Old craft1. dozen to lead lead; cut into strips, with a file play in the interface2. use expanded cement with asbestos3 use the asphalt
The new process adopted at present is groove connection. With groove parts, of course, your ductile iron tube should also be grooved!
Because the interface material used in the old process is poisonous, especially in the water supply pipeline, environmental protection requires a new process now
