Gardner Denver, the Pennsylvania-based maker of pumps used in oil and natural gas drilling, is working with Joele Frank, Wilkinson Brimmer Katcher for PR for its $3.9B acquisition by private equity giant Kohlberg Kravis Roberts & Co., announced today.

KKR is paying a 39% premium -- $76-per-share -- on Gardner Denver’s stock price as of October 24, when the company said it as looking for “strategic alternatives.”

GD, based in Wayne, Pa., with roots going back to the Gardner Governor Company founded in 1859, had 2012 revenues of $2.4B making pumps, compressors and other industrial products for the petroleum, chemical and food sectors.

The deal was unanimously approved by GD’s board and now goes to shareholders with an expected closing date in the third quarter.

Partner Matthews Sherman and managing director Jennifer Meugelmans in Joele Frank’s New York office counsel GD. Vikram Kini is VP of IR at GD.