Oil Block Adapter SpecificationThis oil block replaces the stock RB20DE(T) RB25DE(T) and RB26DETT oil housing mounting directly to the block adding two Dash 10 fittings for oil lines and two 1/8 NPT ports for senders/sensors.Benefits of using the block are twofold :The stock item is a major source of weakness often failing and causing catastrophic engine damage due to oil loss.This block removes the need for a sandwich plate again another weakness within a lubrication circuit.A sound investment to protect your Nissan RB engine whilst adding functionality!