Installing a K-style joint (also known as a MJ joint or mechanical joint) is typically used to join pipe, and here’s how you do it:

Materials & Tools:
K-style joint (MJ joint)
Pipe
Gasket (usually made of rubber)
Bolts and nuts
Cleaning tools (cloth, brush, etc.)
Lubricant (as recommended by the manufacturer)
Wrench or torque wrench
Steps:
Preparation:
Check to make sure all parts are there and undamaged.
Clean the mating surfaces of the pipe and joint with your cleaning tool to make sure they’re free of dust, dirt, and other debris.
Install the Gasket:
Put the gasket in the groove of the joint.
Make sure the gasket is evenly and properly seated in the groove without any twists or deformations.
Lubricate the Gasket:
Apply a coat of the proper lubricant to the joint where the gasket and pipe will meet. Use the lubricant recommended by the manufacturer.
Apply the lubricant evenly so it covers the entire joint where the gasket and pipe meet.
Insert the Pipe:
Align the pipe with the joint, making sure the centerlines of the pipe and joint match up.
Push the pipe into the joint with force. The lubricant will help reduce the resistance.
Make sure the pipe seats all the way into the joint and presses firmly against the gasket.
Install the Mechanical Joint Assembly:
Put the mechanical joint assembly (including the gland and bolts) on the outside of the joint.
Make sure the gland lines up properly, and the gasket is not extruded or deformed.
Tighten the Bolts:
Tighten the bolts progressively in a diagonal pattern (similar to the way you’d tighten lug nuts on a car) to ensure even force.
Use a torque wrench to tighten each bolt in sequence to the torque value recommended by the manufacturer.
Make sure the bolts are tightened evenly to keep the gasket from being loaded unevenly.
Check the Connection:
After you’ve completed the installation, check the connection to make sure the gasket isn’t extruded or deformed.
Check to make sure all the bolts are tightened to the specified torque value.
If it’s a pressure system, pressure test the system to make sure the joint doesn’t leak.
Pro Tips:
Read the manufacturer’s installation instructions thoroughly before installing because different styles of mechanical joint joints may have specific requirements.
Choose the proper lubricant and do not use a lubricant that will damage the gasket material.
Using a torque wrench will help ensure the bolts are tightened evenly to keep the gasket from being loaded unevenly and causing a leak.
By following these steps, you’ll properly install a K-style joint to make a reliable pipe connection.