Parallel Wire Circuits-High Performance. Fisher & Paykel has developed a line of high-performance circuits that has a patented spiral wire circuit technology that is unique to the industry. This technology allows for more consistent temperature delivery throughout the circuit, helping to maintain a virtually condensate-free environment and improvement for optimal humidification. The high-performance circuits are designed for use with the Fisher & Paykel Humidifiers MR730 (use with electrical adapter 900MR900) or MR850 (use with electrical adapter 900MR800). Circuits´ parallel “Y” design features an elbow dry gas line and both a temperature probe tconnection, a dry gas line and both a temperature probe tee and pressure port Foat the “Y”. HTD/Non-Htd: S, Size: A, Circuit Length: 5′, For use with Ventilators: 4,5,6,9,10,11. Pressure Port on “Y”, MDI on “Y”. 10 circuits/case.