<p>Here stove pipe should always be installed with the "<strong>male-end-down</strong>". Installing the pipe male-end-down allows creosote drippings to go back down into your stove instead of running down your pipe onto the stove or floor.The pipe connected to a wood or pellet stove <strong>should not need sealing unless it has a hole or leak in it</strong>. When conditions are right, the negative pressure and natural draw of the stovepipe causes the hot smoky air to rise through the pipe and out the chimney. including gas pipe , electric cable , liquid pipe for more details download this file.</p>