I used this to convert the gas hose of my Rinnai gas stove to a one-touch connection. I used it for about 1 year and 6 months. Please refer to images 3 and 4 for any concerns. Please note that the product should not be used after being removed from a gas appliance. Use at your own risk. Shipping will be via Yu-Packet Post Mini. The item for sale is only the main unit shown in the images; there are no instructions. The following is quoted from the seller's page: ・Appliance Slim Plug This plug connects gas appliances with Rinnai hose-end type (9.5mm inner diameter gas hose connection) to reinforced gas cords (JIS S 2135). Use this when the gas tap side is connected to a reinforced gas cord. ・Precautions ※For city gas and LP gas only. Do not use with other fluids or industrial gases. ※This product is a composite product using metal and rubber, and it deteriorates over time. Even if there are no visible abnormalities, replace it with a new one when replacing the gas appliance (or approximately 7 years from the manufacturing date indicated on the main unit). ※After installing this product, open the gas tap and check for gas odor. If any abnormality is found, close the gas tap, inspect the connection and appearance of this product, and reconnect it. If you smell gas, do not approach any fire. If you do not know the cause, contact your gas provider. ※When attaching to the rubber hose insertion port of a gas tap or gas appliance, insert it fully until the red line is covered. Insufficient insertion can cause gas leaks. ※If any abnormalities such as cracks, cuts, deformation, or swelling are found on the exterior, it can cause gas leaks. Immediately stop using it and replace it with a new product. Do not pass it through areas that cannot be inspected, such as behind ceilings, under floors, or behind furniture. ※Do not use detergents when cleaning. Be careful not to allow foreign objects to enter the interior, and wipe the surface with a cloth. ※When not in use, after confirming that the included protective cap is clean, be sure to attach the cap. Damage to the tip (plug type) or the interior (socket type), or the presence of foreign objects, can cause gas leaks. ※Do not reuse a product that has been removed from a gas appliance. This can cause gas leaks.