what is the capacity of this reservoir bottle?

Assuming to the listed exterior dimensions are correct (7.5x8.25x4.25 inches), the volume is roughly 260 cubic inches. A gallon is 230 cubic inches, so subtracting a few pennies for container thickness and rounded corners, it should still hold near 1 gallon.

What is the distance between the two screw holes at the top?

Mine appears to be 4 inches center to center, but I can see there can be some manufacturing variations (+/- 1/8"). As another reviewer pointed out, the holes are offset towards the outside of the tabs by about 3/16" from the center of each tab.

Does it come with a cap? Photo does not show one.

Mine did in fact come with a vented cap.

What size hose (ID - Inside Diameter) do you use for the fitting at the bottom?

I used the same hose that was in the Lexus since it was in good condition, I don't know the diameter. I just cut of about 1/2" off to make sure of a good fit and contact.

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Dorman 603-001 Coolant Reservoir Bottle

Product ID: 436424894

Details

Brand
Dorman
Item Weight
0.6 Pounds
Item dimensions L x W x H
19.1 x 10.8 x
Material
Plastic
Product Grade
like new

🌎Made in USA quality

🛠️Direct OE fit

🛡️Limited lifetime warranty

€ 117.02

Duties & taxes included

In stock

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Description

🛠️ Upgrade your ride with confidence — the reservoir that works as hard as you do!

TRUSTED BY THOUSANDS - Boasting a 4.5-star rating from over 2,400 satisfied customers, join the community that trusts Dorman for quality and value.
LIGHTWEIGHT DURABLE - Crafted from high-quality plastic weighing just 272g, combining strength with easy handling and installation.
LIFETIME PEACE OF MIND - Backed by Dorman’s limited lifetime warranty, guaranteeing durability and reliability for the long haul.
SEAMLESS OE REPLACEMENT - Fits perfectly as a direct replacement for your original coolant reservoir, ensuring hassle-free installation and optimal performance.
UNIVERSAL COMPATIBILITY - Designed with a universal fit to accommodate a wide range of vehicle models, making it the go-to choice for savvy car owners.

The Dorman 603-001 Coolant Reservoir Bottle is a high-quality, USA-made plastic fluid reservoir designed as a direct OE replacement. It features a universal fit for broad vehicle compatibility and comes with a limited lifetime warranty, ensuring long-lasting reliability. Lightweight and durable, it enjoys strong customer approval with a 4.5-star rating from over 2,400 reviews.

Specifications

ASIN	B000E35UV2
Brand Name	Dorman
Country of Origin	USA
Customer Reviews	4.5 4.5 out of 5 stars (2,446)
Fit Type	Universal
Global Trade Identification Number	00019495081272
Item Dimensions	19.1 x 10.8 x 21 Centimeters
Item Part Number	603-001
Item Weight	0.6 Pounds
Manufacturer	Dorman
Manufacturer Part Number	603-001
Manufacturer Warranty Description	Limited Lifetime Warranty
Material Type	Plastic
Model	603-001
Number of Items	1
OEM Equivalent Part Number	0
Product Grade	like new
UPC	019495081272

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TrustScore 4.5 | 7,300+ reviews

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