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 an air horn, this can cause malfunctions (sound distortion, diaphragm damage, solenoid valve failure), Kishun valves (malfunctions, air leaks, internal link damage, etc.) There are problems, and it is necessary to adjust the pressure to about 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 manual with color photos included 【After-sales support is also available】 The special size bushing screws were manufactured based on the original (made in Japan). Bushing screws can be used for both blind plugs and test nipples. The pressure reducing valve is certified by the international standard ISO9001・2015 (quality) and supports up to 15Kgf/cm2, providing a comfortable margin for safe use. The pressure reducing valve is checked for operation at the time of shipment and is shipped with a setting of approximately 8kg to 8.5Kgf/cm2. ・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.