Part No. NPAK-0052 Replacement knob for NPAK and QTVC fine adjust Replacement parts for hand pumps, calibration manifolds, nitrogen sources and volume contollers Features • Made in the USA NPAK-0052 Specifications Construction Anodized Aluminum Ralston Instruments Inc. | ralstoninst.com | Toll Free 800-347-6575 | Phone 440-564-1430 | Fax 440-564-1480