Description Accessories Description The Meriam Pressure pump comes with an integral variator and bleed valve. The pump has a 1/8" FNPT connection, 0 to -650 mm Hg and is an accessory for the Meriam MFT 4000 Series Modular Calibrator. State of California Proposition 65 WARNINGCancer and Reproductive Harm - www.P65Warnings.ca.gov. Literature & Docs Accessories Meriam Multi Function Modular Calibrator / HART Communicator MFT4000