This item is well made of for durable and practical use. It is simple to connect to campsite water supply, reduces water pressure and protects your filter and hose from damage. working principle can be simply as the entrance pressure and outlet pressure, through the control closure flow inside the opening of the size to control the pressure at the outlet, the water through the opening, closure and fluid resistance is small, the pressure loss is small, the outlet pressure is greater, and vice outlet pressure is small. Feature - : UKCOCO. - ColorGolden - Material: Brass. - Size: Approx. 9 x 7 x 4 cm. - Pressure: PN1.6. - Made of material with precise design. - Our water pressure regulator is reliable and durable. - Simple internal structure, fine workmanship. - It is easy to connect to campsite water supply, reduces water pressure and protects your filter and hose from damage. - Apply to: Hydraulic instability, water flow too fast, water purifiers, energy, gas heater and faucet. Warm Tip: Dear buyer, due to lighting effect, monitor's brightness, manual measurement and etc, there could be some slight differences in the color and size between the photo and the actual item. Sincerely hope that you can understand! Thank you! Package list: 1 x UKCOCO Water Pressure Regulator