UHPI ’s Signature Product. Our heated sample lines are designed to provide an even, gentle heat to the emission sample being tested. A variety of specialized heating elements are available allowing the most complete sample tube coverage possible. That's why Unique provides the most stable temperature profile throughout the length of the line than that offered by any other heated line manufacturer. Stainless steel end caps are standard, as are high temperature, durable polypropylene outer sleeving, although many different sleeve materials are available for a variety of applications. Proportional air feedback is available for immediate cooling of the sample if required at the sample source. For HIGH PRESSURE LINES click here.