IPC 2013 : E03B 11/04 : without air regulator.

IPC2013 > E > E03 > E03B > E03B 11/00 > E03B 11/04[2] > without air regulator.
Notes[t] E01 - E06: BUILDING
E SECTION E — FIXED CONSTRUCTIONS.
E03 WATER SUPPLY; SEWERAGE.
E03B INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER (drilling wells, obtaining fluids in general from wells E21B; pipe-line systems in general F17D).
E03B 11/00 Arrangements or adaptations of tanks for water supply (water-butts E03B 3/03; storage aspects B65D, B65G, F17B, F17C; foundations E02D 27/38; construction or assembling of bulk storage containers employing civil engineering techniques E04H 7/00; tower aspects E04H 12/00).
E03B 11/04 · · without air regulator.