A type IV PFD is a personal flotation device. The classification is given by the United States Coast Guard. It is a device that is throwable.
Type IV
Type IV
In the United States, boats that are 16 feet long or over must be equipped with one Type IV PFD (as classified by the United States Coast Guard) per boat. A Type IV PFD is a throwable floating device; whether the classic "lifebuoy" or "lifesaver" type round version, or the square cushion-like type that are placed on the seats of recreational craft.
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It is designed to be thrown
These are designed to be thrown to a person in the water. Throwable devices include boat cushions, ring buoys, and horseshoe buoys. They are not designed to be worn and must be supplemented by wearable lifejacket.
Anything near to hand that will float and support him. Ideally, a Coast Guard approved Type IV floatation device.
The rhetorical device that is not used or used less than others in paragraph IV is repetition. This device involves repeating specific words, phrases, or ideas to emphasize a point, but paragraph IV may not feature this kind of repetition prominently.
Type IV or the newer type IV which is backwards compatible.
IV Drip maybe?
I, iv, i, v, iv, i