C. F. Keil and Franz Delitzsch on 1 Kings 7:26

1Ki 7:26 “And its thickness (i.e., the thickness of the metal) was a handbreadth” = four finger-breadths, as in the case of the brazen pillars (see at 1Ki 7:15), “and its upper rim like work of a goblet (or of a goblet-rim, i.e., bent outwards), lily-blossom,” i.e., ornamented with lily-flowers. It held 2000 baths; according to the Chronicles, 3000 baths. The latter statement has arisen from the confusion of ג (3) with ב (2); since, according to the calculation of Thenius, the capacity of the vessel, from the dimensions given, could not exceed 2000 baths. This vessel, which took the place of the laver in the tabernacle, was provided for the priests to wash themselves (2Ch 4:6), that is to say, that a supply of water might be kept in readiness to enable the priests to wash their hands and feet when they approached the altar to officiate, or were about to enter the Holy Place (Exo 30:18.). There were no doubt taps by which the water required for this purpose was drawn off from the sea.For the different conjectures on this subject, see Lundius, jud. Heiligthümer, p. 356. Thenius supposes that there was also a provision for filling the vessel, since the height of it would have rendered it a work of great labour and time to fill it by hand, and that there was probably a pipe hidden behind the figures of the oxen, since, according to Aristeas, histor. lxx Interp., Oxon. 1692, p. 32 (also Eusebii praep. evang. ix. 38), there were openings concealed at the foot of the altar, out of which water was allowed to run at certain seasons for the requisite cleansing of the pavement of the court from the blood of the sacrifices; and there is still a fountain just in the neighbourhood of the spot on which, according to 1Ki 7:39, the brazen sea must have stood (see Schultz’s plan); and in the time of the Crusaders there was a large basin, covered by a dome supported by columns (see Robinson, Pal. i. 446). But even if the later temple was supplied with the water required by means of artificial water-pipes, the Solomonian origin of these arrangements or designs is by no means raised even to the rank of probability.  - The artistic form of the vessel corresponded to its sacred purpose. The rim of the basin, which rose upwards in the form of a lily, was intended to point to the holiness and loveliness of that life which issued from the sanctuary. The twelve oxen, on which it rested, pointed to the twelve tribes of Israel as a priestly nation, which cleansed itself here in the persons of its priests, to appear clean and holy before the Lord. Just as the number twelve unquestionably suggests the allusion to the twelve tribes of the covenant nation, so, in the choice of oxen or bullocks as supporters of the basin, it is impossible to overlook the significance of this selection of the first and highest of the sacrificial animals to represent the priestly service, especially if we compare the position of the lions on Solomon’s throne (1Ki 10:20). 1Ki  7:27

The Brazen Stands and Their Basins.The description which follows will be more easily understood by comparing it with the sketch given in my biblische Archäologie, Taf. iii. fig. 4.  - He made ten stands of brass, each four cubits long, four cubits broad, and three cubits high. מכנות, stands or stools (Luther), is the name given to these vessels from their purpose, viz., to serve as supports to the basins which were used for washing the flesh of the sacrifices. They were square chests cast in brass, of the dimensions given.