A  Genuine SU HS4 Carburettor Dashpot Piston & Spring 

Used

 MG MGB MGBGT circa 1973

Free moving & smooth

Spring loaded bias needle upgrade Code AAA

AUC 1331 ( Piston part number )

In used condition with some marks , tarnishing dirt & scratches to the metal

Actual items pictured - please zoom in 

LR4