Genuine Husqvarna Carburetor 
Part #: 578936901

Fits these models and more:
T 435 - Husqvarna Chainsaw (2017-10)
CARBURETOR

T 435 - Husqvarna Chainsaw (2019-01)
CARBURETOR & AIR FILTER

T 435 - Husqvarna Chainsaw (Original)
CARBURETOR & AIR FILTER

GZ 3500 T - RedMax Chainsaw (2017-10)
CARBURETOR