SET OF 10Aluminum pump jet plug.
On the Carter B&B it would be #29 on the photo. This goes inside the float bowl, the check ball goes in 1st, then this plug. Originally these were brass screw plugs and we sometimes have used screw in plugs listed on the web site if you prefer the original. The aluminum plug is ok, but are not easy to remove.
Used on many applications including:
Rochester Monojet - passage pump jet plug
Replaces OE: 11B-108, 11B108