Derale 25720 GM Thermostatic Sandwich Adapter w/1/2 NPT Ports

GM Thermostatic Sandwich Adapter with 1/2" NPT Ports High quality die-cast aluminum thermostatic sandwich adapter with 1/2" NPT ports and an O-ring diameter of 3 1/2", this adapter provides external oil lines to allow the addition of an engine oil cooler to most 1963-2007 GM V-8 engines. It installs between the stock engine oil filter landing and the oil filter. Stock filter is retained. GM Thermostatic Sandwich Adapter with 1/2" NPT Ports