1. Singlelock ring's bell and spigot joint
Apply to moderate or low pressure underground buried pipeline

2. Double lock ring's bell and spigot joint
Applied to the high pressure underground buried pipeline, carried on single tension opening pressure test

3. bell and spigot joint
Applied to the heavy-caliber pipeline with high pressure and complex loading

4. sealing-in
Applied to the connection of various pressure pipeline and pipe fittings. A and L is decided by service condition

5. bell and spigot "O" Seal nylon stickThe "O"key lock opening is mainly used for pipeline which endures large axial tension, just like the deep well tube.

6. Flange connection
Applied to the connection of moderate or low pressure pipeline and equipment, be consistent with such standards as HG?JB?GB?ASTM?DIN?NF?JIS etc.