Some oil pans are designed with a recessed drain hole, which may prevent the valve from being installed properly. If the valve can not be tightened all the way without hitting the oil pan wall, do not install the Drain Valve in your vehicle. Thread Size: 27mm x 2.0 (Both Male and Female threads) Primary Applications: Specifically required for heavy-duty commercial truck engines, most notably the Detroit Diesel DD13, DD14, and DD15 series, as well as select heavy-duty Volvo engine setupsMaterial Composition To ensure the part can handle the harsh thermal environments of a heavy-duty engine underbelly, this oil drain is made out of: Base Metal: High-grade, forged Brass and Stainless Steel. Exterior Coating: Nickel-plated / Nickel-coated finish. This adds an extra layer of defense against road salt, environmental debris, and rust. Adapters are available for some models