Home / Engine / Kat’s K4B frost plug engine heater “Preferred TH18 thermostat” has been added to your cart. View cart Kat’s K4B frost plug engine heater$12.00 1 in stock Kat's K4B frost plug engine heater quantity Add to cart SKU: ENG-MB-006 Category: Engine Description Kat’s K4B frost plug engine heater – SKU ENG-MB-006 New Old Stock Kat’s K4B frost plug engine heater – pulled from the inventory of Merchand Brothers, long-time independent mechanics in White River Junction, Vt. Related products SPM 60695 gasket $1.50 Add to cart SPM 60720 gasket $1.00 Add to cart SPM 60702 gasket $1.50 Add to cart Daikin SC-330 clutch disc $12.50 Add to cart