what size is the flexible/rubber transmission cooler hose?

2007 TOYOTA COROLLA
260,700 MILES • 1.8L • 4 CYL • 2WD • AUTOMATIC
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YAZIDAN
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Hi,
Transmission cooler.
wondering what size is the flexible/rubber transmission cooler hose . I am debating if it is 5/16 or 11/32.
Sep 8, 2025 at 7:29 AM
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STRAILER
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Toyota specs them in metric (8 mm I.D.), which translates almost exactly to 5/16" (7.9 mm).

11/32" (8.7 mm) hose will also slip on, but it’s a slightly looser fit. It can work in a pinch if clamped well, but 5/16" will give you the proper snug fit. Let us know if you need anything else.
Sep 8, 2025 at 12:07 PM