Montgomery County lawmakers are set to examine on Tuesday billionaire Mitchell Rales’ controversial request for a sewer connection to his private art gallery in Potomac.

Rales, whose net worth is estimated to be $3.7 billion, is the co-founder of manufacturing giant Danaher, parent of Craftsman Tools. Danaher generated $16.1 billion in sales in 2011. On his 127.7-acre estate near the C&O Canal, he also operates Glenstone, a private art gallery open to visitors by appointment on Thursdays and Fridays.