StacksVerified U.S. regulatory reference

46 CFR §64.35

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
If an MPT is designed with a filling or discharge connection in the bottom, the connection must be fitted with a bolted blank flange, threaded cap, or similar device to protect against leakage of the product, and a manually operated valve that is located—
  1. (a)Inside the tank and operated outside the tank; or
  2. (b)Outside the tank but as close to it as practicable.