9 CFR § 590.532 - Liquid egg holding.
(a) Tanks and vats used for holding liquid eggs shall be of approved construction, fitted with covers, and located in rooms maintained in a sanitary condition. Notwithstanding the foregoing, tanks designed for installation partially outside of a room or building are acceptable, providing all openings into the tanks terminate in the processing room.
(b) Liquid egg holding tanks or vats shall be equipped with suitable thermometers and agitators.
(c) Inlets to holding tanks or vats shall be such as to prevent excessive foaming.
(d) Gaskets, if used, shall be of a sanitary type.