Reference vest
Reference vest means a model AK1 PFD meeting subpart 160.047 of this part, except that, in lieu of the weight and displacement values prescribed in Tables 160.0474(c)(2) and 160.047(4)(c)(4), each front insert must have a weight of kapok of at least 8.25 oz. and a volume displacement of 9.0 0.25 lb., and the back insert must have a weight of kapok of at least 5.5 oz. and a volume displacement of 6.0 0.25 lb. To achieve the specified volume displacement, front insert envelopes may be larger than the dimensions prescribed by 160.0471(b).