Triumph Billet Aluminum Inspection Plug SET/3 57-2166 650 750 BSA Carburetor Two single-lipped seals per leg

Two single-lipped seals per leg

the first year of all unit construction

They're also suitable for just about all Triumph 500/650 pre-unit machines

Ducati part number 0795-37-063

First used about 1995

Triumph Billet Aluminum Inspection Plug SET/3 57-2166 650 750 BSA Carburetor Two single-lipped seals per legMagically lovely, and functionally identical to the original cast versions. CNC machined and polished, Triumph BSA's part number is 57 2166 or T2166. They should fit just about any vintage Triumph or BSA engine. Listing is for THREE PIECES, which is what you'd need for most UNIT Triumph 500 650, and pre 79 Triumph T140 750 apps.