Wrapping Connection: Align the two pipes and wrap them with a resin-impregnated reinforcing material (such as fiberglass cloth) to the appropriate thickness and width. This connection provides good sealing, can withstand high internal pressure, and is suitable for straight pipes, elbows, etc.
Flanged Socket Connection: Flare one pipe into a bell shape, insert it into the other pipe, and seal it with a rubber gasket. Various designs are available; sometimes called an "O-ring" connector.
Sleeve Connection: Use a sleeve with a slightly larger diameter, coat the inside with putty, and also coat the outside of both pipes with putty. Then insert the sleeve. It is ready to use after the putty has cured.
Hose Connector Method: Slide a rubber sleeve over the joint of the two pipes, secure it with a stainless steel band, and tighten it with screws.