This is an automatic transmission Vacuum 

Modulator for the vehicles listed below;

   1962-63   Chevrolet w/Powerglide

   1962-63   Chevrolet Chevy ll  w/powerglide

   1960-69   Chevrolet Corvair

   1961-62   Pontiac Tempest

Replaces GM 3812741, has 1 inch hex and 13/32" hole. 

Please email questions, but give me time to respond. 

Don't forget to check out my store. Have a great day 

and HAPPY EBAYING!!!!