Product Summary

Universal Fit, 1.62" Overall Length, Brass, Natural

  • Pressure relief valve required
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Key Specs

MFG. Part #91015805
Overall Length1.62"
Inside Diameter.19"
Thread Pitch1/4" NPT
Material TypeBrass
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Need To Know

Quick and Easy Returns

Return Policy

Speedway Motors 91015805 Details

This valve is used with Speedway's aluminum T-bucket radiator (91015600). It threads into a 1/4" NPT hole in the top radiator tank and it limits the pressure in the radiator to 15 psi.

The aluminum T-bucket radiator does not use a conventional "pressure" radiator cap, rather it uses the decorative "T" caps to seal the neck at the top of the radiator.

The arrow on the valve indicates the flow from the radiator if unit has arrow noted on side of fitting.  If no arrow is noted, the radiator side of the fitting or 'inlet'  side can be identified as the end with the allen hex fitting threaded into the end of the unit.  The oposite end or the smooth bore end on the opposite side is the 'outlet' end or the over flow hose side.

Item Details

Required for 91015600

Speedway Motors 91015805 Specifications

KEY SPECS
MFG. Part #91015805
BrandSpeedway Motors
Overall Length1.62"
Inside Diameter.19"
Thread Pitch1/4" NPT
Material TypeBrass
FinishNatural
GENERAL
Thread Length.45"
Sold in QuantityEach
NotesThreads into Speedway Aluminum T-Bucket radiator to limit pressure to 15 psi. Required for PN# 91015600

Ratings & Reviews

4.3

30 Reviews

Overall Assessment

The product, likely a radiator relief valve, receives a variety of reviews. Customers commonly mention qualities such as the product's practicality, ease of use, and excellent fit. The valve appears to be robust, well-built, and designed for easy installation. Some have found it very effective, fixing pre-existing radiator issues, suitable for models like the T bucket and useful even on water-cooled chargers and hot rod builds. On the flip side, concerns about its usability and durability were also brought up. One customer reported that the product's rubber seal tends to degrade over time, and lack of available replacement parts was a concern. Another customer claimed that a malfunction led to damage on their Speedway Model T radiator. Aesthetic improvements, clarity regarding installation, and better return functionality were also proposed. Despite the mix of feedback, there are still several positive recommendations, endorsing the product for its general function and utility.

4.3

30 reviews

5

18

4

7

3

3

2

0

1

2

Most Liked Positive Review

4.0

I used this item on a pressure tank

This is the only Company that carried the pressure valve . I looked everywhere ! I needed a 20lb. pressure valve , but this is working . I am using it on a diesel engine , that when under load gets a little hotter than a gas engine . I know it will work great on a gas engine .

Most Liked Negative Review

1.0

not good product for tbucket radiators

this is a good product maybe on another application, it will not return water to the radiator on tbucket from overflow tank.

Filter by Ratings

Yes

5.0

a year ago

Jefg

Lake Havasu City, Arizona

Verified

Using product on a cooling system that has an unvented radiator cap, perfect at 15 psi rating.

Would Recommend

no I would not

4.0

2 years ago

jeff

north attleboro, mass.

Verified

this relief valve was recommended for the type of radiator I purchased for my 23 T bucket and after talking to the tech I was informed this was a one way valve and that I couldn't use a recovery tank for the radiator, this valve should be a two way valve so you can use a recovery tank

Would Not Recommend

I would buy this valve from you again if I needed to!

5.0

2 years ago

CB

Mayer Arizona

Verified

The bucket is running cool and smooth again thanks to your parts!

Would Recommend

For this radiator you have to have, so yup would buy again

3.0

4 years ago

Dino

Longview

Verified

I have to buy another fitting to connect the overflow hose.

It works

3.0

4 years ago

Jerry

Nevada

These relief valves do work as advertised. However, they do not last very long. The replaceable special made little inner rubber seal will eventually fizzle out and will drip coolant usually when on the road. No special little replacement rubber seal is available, which is the only part that actually fails. I carry a spare valve because of this.

Would Recommend

Yes I would

5.0

4 years ago

Cliff's t

Abilene Tx

Verified

Fit great

I will definitely be buying from speedway motors again.

5.0

5 years ago

Badger

Nokomis Florida

Verified

I would definitely recommend to my buddies

Would Recommend

I would buy this again

5.0

5 years ago

Richard

Bartlesville, Oklahoma

Verified

Easy to install

Would Recommend

Yes I would buy this again if I had a need

5.0

5 years ago

Mike

Pinckney Michigan

Verified

Haven't actually used the radiator this fitting goes in, as the car it is going in still has about two years away from being done.

Would Recommend

yes

5.0

5 years ago

Pat

Rio Dell Ca.

Verified

overflow for T bucket

Would Recommend

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Questions & Answers

11 Questions • 12 Answers

I the bought Speedway's aluminum T-bucket radiator (91015600) and there is no threaded hole in the neck. What drill bit & tap do you recommend to screw this coolant relief valve on? Do I need use pipe thread tape?

by Bob

• 4 years ago

1 answer

I have the 91015805 coolant relief valve on my T-bucket radiator. When the engine cools down, both radiator hoses collapse. Is this valve supposed to let air back into the system during the cool down to prevent a hose collapsing vacuum?

by Ron

• 8 years ago

1 answer

what is the flow rate?

by gilbert

• 10 years ago

1 answer

Can the pressure at relief be adjusted to 3 psi?

by KHF

• 10 years ago

1 answer

Just to clarify, properly installed, the arrow on the valve points towards the ground, correct? Thank you, Larry

by Larry

• 10 years ago

1 answer

I want the radiator to recover the coolant. Can a second relief valve with a very weak check spring, or with the spring removed, be installed parallel but reversed. Pressure would hold it shut and vacuum would open it and suck the coolant back to radiator.

by Jolly

• 10 years ago

1 answer

is this a one way valve, or does it allow coolant to be drawn back into the radiator?

by boaty

• 10 years ago

1 answer

Do I need this part if I use an overflow tank?

by Sean

• 10 years ago

1 answer

What size straight fitting do I need to route coolant from your model T radiator?

by Fred

• 14 years ago

1 answer

is there a spot to install this valve, if so where is it? or do i have to drill and tap a spot?

by rudy watt

• 15 years ago

3 answers

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