Division 1.1
United Kingdom
The liquid coupler on the loading arm must be a female coupler which must mate with a 4-inch API (101,6 mm) male adapter located on the vehicle as defined by:
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API Recommended Practice 1004
Seventh Edition, November 1988.
Bottom loading and vapour recovery for MC-306 tank motor vehicles (Section 2.1.1.1 — Type of adapter used for bottom loading)