43 CFR § 3173.3 - Oil measurement system components - seals.
(a) Components used for quantity or quality determination of oil must be effectively sealed to indicate tampering, including, but not limited to, the following components of LACT meters (see § 3174.8(a)) and CMSs (see § 3174.9(e)):
(1) Sample probe;
(2) Sampler volume control;
(3) All valves on lines entering or leaving the sample container, excluding the safety pop-off valve (if so equipped). Each valve must be sealed in the open or closed position, as appropriate;
(4) Meter assembly, including the counter head and meter head;
(5) Temperature averager;
(7) Back pressure valve pressure adjustment downstream of the meter;
(8) Any drain valves in the system;
(9) Manual-sampling valves (if so equipped);
(10) Valves on diverter lines larger than 1 inch in nominal diameter;
(11) Right-angle drive;
(12) Totalizer; and
(13) Prover connections.
(b) Each missing or ineffectively sealed component is a separate violation.