(a) The hydraulic releases referred to under § 160.062-1(a)(1) are of the diaphram-spring plunger type, which releases a buoyant load under hydrostatic pressure.

(b) All hydraulic releases given an approval under this subpart shall be designed and tested to operate with spring-tensioned gripes. Such gripes shall be considered as a part of each approval.

(c) Alternate designs will be given special consideration, but the expense of their preliminary investigation at a laboratory accepted by the Commandant shall be borne by the manufacturer.