33 CFR § 401.22 - Preclearance of vessels.
(a) No vessel, other than a pleasure craft 300 gross registered tonnage or less, shall transit until an application for preclearance has been made, pursuant to § 401.24, to the Manager by the vessel's representative and the application has been approved by the Corporation or the Manager pursuant to § 401.25.
(1) The expiration of the representative's guarantee of toll payment,
(2) A change of representative of the vessel,
(3) A material alteration in the physical characteristics of the vessel, until another application for preclearance has been made and approved, or