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housings used with seat parachutes are expandable as well. The reason that ripcord housings are compressible and non- expandable is to prevent premature loading of the cable and pin as the rig is donned and the user moves around. One-pin sport container systems generally use a .26" inside diameter housing. Two-pin and most military containers use a .375" inside diameter housing. Ripcord housings are measured under slight tension. 

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The 3-ring release system employs the smaller .20" or .18" housing for use with Lolon (yellow), or Teflon (orange or red), coated release cables. These “cutaway” housings must be expandable and non-compressible. The reason for this is, in the case where the loop load is excessive, the non- compressible housing will resist the loop or “push” against it allowing an effective “pull” of the cable from the loop. 

