Tech Air, a private equity-backed distributor of specialty gases - including nitrous oxide and liquid nitrogen - and welding supplies, is set to buy two New York companies for an undisclosed sum.

The Danbury, Connecticut-based buyer took over Prest-O-Sales & Service Inc. and Prest-O-Peconic Inc., distributors of industrial, specialty and medical gases operating out of Queens, New York and Long Island. The companies, which were founded in 1926 and 1985 respectively, serve a wide range of customers and industries. Former owners, Jim Madison and George Nunnaro, are expected to continue involvement with the Prest-O-Sales and Prest-O-Peconic.

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