HOI - Internal Housing Inverted Ring-Axially Assembled-Internal Inch
The HOI Housing Ring functions like a HO ring in a housing or bore, except the lugs are “reversed.” It is Axially Assembled but is inverted internally. This particular version reduces the distance the lugs of the standard HO extends into the inner circumference of the bore (or housing). It also allows for another assembly to pass through unimpeded.
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