12" Finned Aluminum Heat Sink Transmission Cooler

• Single-pass heat sink design cools transmission fluid, no airflow needed

• Most compact size in this family for tight mounting locations

• Uses 3/8" NPT fittings — larger than TSP's dual-pass cooler line

• 12" tube length; confirm 14 1/4" x 3 1/4" overall footprint fits

Cooler transmission fluid helps prevent damage under demanding conditions, supports more reliable shifting, and extends automatic transmission life. This single-pass heat sink transmission cooler is built to deliver that benefit without requiring airflow, thanks to its compact finned aluminum design — making it the most space-efficient option in this single-pass cooler family.

This cooler fits any application using 3/8" NPT hose fittings, with 3/8" NPT female threads on both inlet and outlet — larger than TSP's dual-pass cooler line, which uses 1/4" NPT. Verify your hose fitting size matches 3/8" NPT before ordering, especially if comparing against the dual-pass line. Two hose fittings are included. Fluid capacity is 14 oz.

Before installing, confirm your available mounting space against the full 14 1/4" x 3 1/4" overall dimensions — the "12"" in this cooler's name refers to tube length, not the total footprint.

Applications
Universal fit for any application using 3/8" NPT hose fittings; used for automatic transmission cooling in space-constrained mounting locations, and for applications specifically requiring 3/8" NPT fitting compatibility.

Sizing
12" tube length, 14 1/4" x 3 1/4" overall dimensions, 1 cooling row (single-pass), 14 oz fluid capacity, 3/8" NPT female threads (inlet and outlet).

Does this cooler need airflow to work?
No — this cooler uses a heat sink design that does not require direct airflow, allowing it to be mounted in a variety of locations.

What's the difference between this and TSP's dual-pass cooler line?
This is a single-pass design with one cooling row and 3/8" NPT fittings. TSP's dual-pass cooler line uses two cooling rows and 1/4" NPT fittings, so the fitting sizes are not interchangeable between the two lines.

Is 12" the total length I need to plan mounting space for?
No — 12 inches refers to the cooler's tube length. The complete mounting footprint is 14¼" x 3¼", so use those dimensions when checking available installation space.

What hose fitting size does this cooler use?
The inlet and outlet use 3/8" NPT female threads. Two hose fittings are included.

What's the difference between this and the 15"/18"/24" single-pass versions?
This 12-inch version has the smallest footprint and lowest fluid capacity at 14 oz in the single-pass family, making it well suited to the tightest mounting spaces.