Vertical caving terminology and methods > Personal SRT gear
A top jammer that is connected via a safety cord to the D-ring. It must be easy to connect to the rope using just one hand. Both of these points are served by the standard top jammer arrangement, so in almost all cases, the standard top jammer can be considered a quick attachment safety. This can be clipped above a chest roller for safety when rope walking. It can be clipped to the rope instead of the normal top jammer when using the three phase system in Texas system mode. It can be clipped to the top jammer's footloop when using the tree phase system in Plummer system mode. It can also be used as an attachment to the rope in any position where there is nothing to clip a cows tail to. It should be noted that this is not as safe as a cows tail, as most ascenders are not designed to be shock loaded. However, it is required with indestructible rope technique, since there is frequently nothing to safely clip a cows tail into. With Alpine rigging, it is occasionally needed, such as when it is hard to reach from a Y-hang up to a traverse line in order to clip a cows tail into it, or when derigging a traverse line such that cows tails cannot be clipped into it. The term is only used in the USA, but has no equivalent in Britain. British cavers simply talk about putting their top jammer on the rope.
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