StacksVerified U.S. regulatory reference

33 CFR §183.530

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
Except when used for a tank fill line, each spud, pipe, or hose fitting used with hose clamps must have:
  1. (a)A bead;
  2. (b)A flare; or
  3. (c)A series of annular grooves or serrations no less than 0.015 inches deep, except a continuous helical thread, knurl, or groove.