What size is the flexible/rubber transmission cooler hose?

Tiny
YAZIDAN
  • MEMBER
  • 2007 TOYOTA COROLLA
  • 1.8L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 260,700 MILES
Hi,
Transmission cooler.
wondering what size is the flexible/rubber transmission cooler hose. I am debating if it is 5/16 or 11/32.
Monday, September 8th, 2025 AT 7:29 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
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.
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Monday, September 8th, 2025 AT 12:07 PM

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