Honda D Series Water Connecting Pipe Gasket 91314-634-000

Genuine Honda Water Pipe O-Ring Gasket (91314-634-000)

This is the gasket that seals your water connecting pipe, and it's one of those parts that costs almost nothing and causes real headaches when it's ignored. The connecting pipe is a major coolant passage running through your engine, and it has a flared end on each side where an O-ring gasket seats. When that rubber gets old and hard, it stops sealing and you get a coolant leak that's annoying to trace because it's tucked away where you can't easily see it. This is the genuine Honda replacement.

You Need Two Of These

Read this before you check out, since these are sold individually. The water connecting pipe has a gasket at each end, so a complete job takes two. Order one and you'll be halfway through with a leak still on the other side.

And there's no good reason to reuse the second one. Both gaskets have lived the same life under the same heat for the same number of years, so if one has hardened up, the other is right behind it. They're cheap, you're already in there, buy the pair.

Do It While You're In There

Getting to the water connecting pipe usually means having other things apart, so this is a part you replace opportunistically. If you're doing a water pump, a timing belt, a head gasket, a coolant system refresh, or building an engine on a stand, put fresh gaskets on the pipe while you have access. Rubber this old is a known wear item, and coming back for it later means tearing things apart a second time over a couple of dollars in parts.

Use The Genuine Gasket

This seals a coolant passage, so it's not a spot to gamble. The gasket has to seat correctly in that flared end and stay pliable through years of heat cycling, and a generic O-ring that's close on dimensions but wrong on material will harden and leak sooner. This is the exact part Honda spec'd, so it fits the flare properly and seals the way it's supposed to. On something this inexpensive, buying the correct piece is an easy call.

Fits A Huge Range Of Honda And Acura

This is one of those parts Honda used for decades. It covers all D-series engines, D15, D16, and D17 variants included, plus the L-series in the first-gen Fit and plenty more:

With coverage this wide, it's worth a quick check against your engine's parts diagram, but if you're running a D-series or one of the cars above, this is your gasket.

Who Should Grab These

This is for anyone chasing a coolant leak around the water pipe, refreshing an older engine's cooling system, or building a D-series and putting it back together with fresh seals throughout. It's a cheap part doing an important job on an engine that's probably decades old by now. Grab two, get them on, and stop worrying about that pipe.

Part number: 91314-634-000. Type: genuine Honda water connecting pipe O-ring gasket. Quantity: sold individually, two required per water connecting pipe. Fits: all D-series (D15, D16, D17), L-series first-gen Fit, and the models in the table above.