Thank you very much for viewing. ★★High-Quality Air Valve Included★★ (Made of SUS304) Elbow Change (Image 3) Brass (140kg) → High-Pressure SUS304 Stainless Steel (300kg or more) Our kit includes a special size bushing at this price. For current Quon models (April 2017), the air pressure is approximately 12 kgf/cm2. In the case of air horns, this can cause malfunctions (sound distortion, diaphragm damage, solenoid valve failure) and for Kishuun valves (malfunctions, air leaks, internal link damage, etc.). It is necessary to adjust the pressure to around 8 kgf/cm2 to 9 kgf/cm2 with a pressure reducing valve. 【Pressure Reducing Valve Set Contents】 ① Pressure Reducing Valve (with stay) - Supports up to 15kg ② SUS304 Stainless Steel Elbow (Supports high pressure of 300kg or more) ③ One-touch coupler (Made in Japan) ④ Special size bushing screw ⑤ Seal tape ⑥ Installation instructions with color photos are included. 【After-sales support is also available】 The special size bushing screw was manufactured based on the original (Made in Japan). The bushing screw can be used for both blind plugs and test nipples. The pressure reducing valve is certified under the international standard ISO9001:2015 (Quality) and supports up to 15 kgf/cm2, providing a comfortable margin for safe use. The pressure reducing valve is checked for operation at the time of shipment and is set to approximately 8kg to 8.5Kgf/cm2 before shipping. ・Elbow maximum working pressure: 320Kgf/cm2 ・Air coupler maximum working pressure: 15Kgf/cm2 Please note that we are not responsible for any accidents, injuries, damage, or any other issues that may occur during installation. 【Notes】 We do not issue receipts as we are selling as an individual. Please understand. The appearance varies depending on the company. Please check the images carefully and confirm that installation is possible before purchasing. Please refrain from asking questions regarding the diameter and size of the screws. Please refrain from asking for discounts. 【Returns】 Please contact us within one week for initial defects. Please check the product as soon as it arrives. 【Shipping】 We ship on Sundays and holidays.