Adapter booster T46E4 permits the use of a 1.5-inch thread size mechanical tail fuze in new series, low drag GP bombs and MC-1 gas bombs. Because of a two inch adapter ring the metal closing plug has been replaced with a plastic plug. The maximum length of adapter booster T46E4 with the plastic plug is 7.96 inches.
Adapter booster T46E3 is identical to adapter booster T46E4 except that it has no locking pin hole in the adapter assembly. This locking pin hole serves to lock adapter booster T46E4 in place when assembled in the bomb. Adapter booster T46E3 also contains a tag marked DO NOT USE WITH LONG DELAY FUZES.
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