Weil Gotshal & Manges and O’Melveny & Myers are both celebrating niche mergers with high profile roles on the $620m (£400m) disposal of Vivendi-owned United States Filter Corporation’s (USFilter) Waterworks Distribution Group subsidiary.

The cash purchase sees the division sold to JP Morgan Chase’s private equity arm, JP Morgan Partners, and Boston-based buy-out house Thomas H Lee Partners, respectively advised by O’Melvenys and Weil Gotshal.