Around the pipe turns it to complete the connection. Its working  principle is to change the force of the clamp into the torque, with the force in  the direction of the twist is even more tight.

(1) To select the appropriate  specifications;
(2) The opening of the clamp head is equal to the diameter of the workpiece;
(3) The clamp head should clamp the work piece and then force it to prevent  slipping;
(4) With the boosting rod, the length should be appropriate. Move the handle,  note bearing torque, not excessive force, to prevent overload damage;
(5) To keep the teeth and the adjusting ring clean;
(6) It generally cannot be used as a pipe wrench hammer;
(7) The workpiece can not hold temperature more than 300 degrees celsius