If you have the Hammar MA1 UL auto-inflator on your PDF it has a water sensitive bobbin similar to the non-HIT models.
http://www.cmhammar.com/products/lifejacket-inflators/ma1-ul/ The HIT technology places the bobbin in a chamber behind a small spring loaded flap ( Unique hydrostatic valve that protects the water sensitive element. ) Michael Brown Windburn C&C 30-1 Message: 1 Date: Sat, 28 Dec 2013 12:44:35 -0800 From: Paul Baker <pauljba...@shaw.ca> To: cnc-list@cnc-list.com Subject: Re: Stus-List PFD/life vest Message-ID: <52bf3833.8060...@shaw.ca> Content-Type: text/plain; charset=ISO-8859-1; format=flowed I have a pair of Mustang HIT auto-inflators (these do not use those paper tablets to trigger the inflation so should be far more reliable, they have a 5 year service cycle on the inflator mechanism, the standard ones are at most 2 years), and recently for some more offshore type racing I have also got a Spinlock deckvest (again not the paper trigger type) with integrated harness, leg straps and a matching Spinlock tether. Both types are comfortable and I always wear them when outside of the cockpit (or at all times when singlehanding). Remember with any inflatable vest, it only counts as a PFD when actually worn, if the CG come checking then having it hanging below means it is worthless. If you are the sort that likes to sail in nice weather without any sort of PFD being worn, make sure you have a non-inflatable onboard for each person as well.
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