DEF Turbine Oil Drain Joint 10AN Flange Adapter — Silver Anodized Aluminum, 450°C O-Ring Included

DEF Turbine Oil Drain Joint 10AN is a silver anodized aluminum flange adapter that converts a T3/T4-style turbo oil outlet to a 10AN hose connection for a reliable, leak-resistant turbine oil return.

This compact adapter provides a clean, serviceable connection between oil-cooled turbochargers (T3/T4 families and many GT-series units) and 10AN drain plumbing. Machined from aluminum alloy and finished with an anodized surface, the DEF flange replaces the factory drain flange when you need a larger AN hose, a serviceable fitting, or when retrofitting a hybrid turbo. The kit ships with a high-temperature O-ring and mounting hardware so it arrives ready to install.

Which turbochargers will this drain joint work with?

The DEF flange is designed for common oil-cooled turbine housings with the 2-inch bolt spacing found on many T3 and T4 variants. It fits many T3/T4 designs, T3-T4 hybrids and several GT and T6x series turbos, but is not compatible with TURT60 housings.

• Compatible: T3, T4, T3/T4 hybrid housings
• Also fits: GT30, GT32, T60, T61, T66, T60-1, T70, SUPER 70
• Bolt hole center spacing: 2.0 in (51 mm)
• Not compatible: TURT60 housings

How does this adapter prevent oil leaks and withstand heat?

DEF includes a 450°C-rated O-ring to seal the flange-to-turbo joint, reducing the risk of leakage and deformation under high temperatures. The anodized aluminum body resists corrosion while remaining lightweight, and the supplied bolts ensure correct clamping without requiring additional parts.

• Supplied 450°C rated O-ring for high-temperature sealing
• Anodized aluminum alloy body for corrosion resistance
• Includes two M8 x 1.25 mm bolts for secure mounting
• Designed for a 10AN hose connection for larger drain plumbing

What does the package include and what tools are needed for installation?

The kit contains the flange adapter, two M8 bolts and a high-temp O-ring so you have the essential parts to attach it to compatible turbo housings. Installation generally requires common hand tools and standard torque practice to avoid over-tightening and to preserve the O-ring seal.

• Package: 1 flange adapter, 2 M8*1.25 bolts, 1 O-ring
• Tools: wrench/socket set for M8 bolts, torque wrench recommended
• Preparation: clean turbo flange mating surface and inspect oil return path
• Notes: use correct torque and replace O-ring if damaged

Will this change oil return flow or require additional modifications?

Switching to a 10AN drain connection can improve plumbing options and reduce restriction compared with smaller factory drains, but it does not alter internal turbo oil passages. Ensure drain hose routing promotes gravity return to the oil pan and avoid upward loops that could impede flow.

• 10AN fitting simplifies larger drain hose connections
• No internal turbo machining required for compatible housings
• Verify gravity-fed route and avoid high points in drain line
• May require hose ends and clamps specific to 10AN plumbing

Who this is for: The DEF Turbine Oil Drain Joint 10AN is aimed at tuners, fabricators and mechanics who retrofit or maintain oil-cooled turbos and need a durable, serviceable 10AN return fitting. It suits owners upgrading drain plumbing on T3/T4 family turbos, builders using GT-series castings listed above, and anyone who wants a corrosion-resistant, high-temperature seal without modifying the turbo's internal oilways. If you have a TURT60 housing or a non-matching bolt pattern, verify compatibility before ordering.