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WIKA Instrument Corp. Model 213.40 4" Meter. 30-0-160 PSI 1/4 NPT/LM. Rear flange. We have not tested and do not have the ability. There appears to be some meter liquid (Glycerine ?) leak or creep from the top fill (?) area or cap/cover. Sold AS-IS AS-Found for Parts or Repair with No Return. . Enjoy!
Quality Products for the More Knowledgeable and Experienced User !