United Flexible Inc., an Arlington Capital Partners company, has acquired Fulton Bellows LLC, maker of components for gas and fluid control systems. The deal, terms of which were not disclosed, is the second one related to Arlington Capital announced in February.

The Washington, D.C.-based private equity firm is buying the defense and security business of iRobot Corp. (Nasdaq: IRBT) with plans to operate it as an independent company supplying robots to the U.S. military and others. In October, Arlington Capital sold aerospace engine maker MB Aerospace to the Blackstone Group LP (NYSE: BX). Arlington Capital manages $1.5 billion of committed capital in three funds focused on middle-market opportunities in aerospace and defense, government services and technology, healthcare, and business services and software.

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