LPF™ Gauges Uniweld’s 2-1/2″ LPF™ Limited Pointer Flutter™ Gauges with large, easy-to-read dial faces provide improved accuracy of pressure readings. Features include a high torque hairspring movement and a special pulsation dampener. NPF® Gauges The original NPF® No Pointer Flutter® Gauges provide steady and accurate pressure readings. The encapsulated silicone-dampened movement seldom needs recalibration. The gauge is guaranteed not to leak fluid and not to lose dampening characteristics. Scales are printed in refrigerant colors. A2L Gauges R-32/R-454B/R-448A/R-410A PSI/F˚ Replacement Gauges 3-1/8” [80mm] G439ND – A2L Red, Pressure G440ND – A2L Blue, Compound