ABSOLUTELY excellent customer service and product works exactly as described. This element is placed at the end of the vacuum suction hose and measures the suction power (water pressure). If you want to test the vacuum suction's performance, it works great and the 80-inch water speed is said to be very reliable. Bought to test our company's vacuum suction power and provide valuable data. The item was originally damaged (glass cracked) but appears to have been caused by the shipping company. Contacted seller and received EXCELLENT SERVICE in exchange for a replacement. Still amazed at how quickly the company responded to my damage claim, indicating a quality company that stands behind their products.