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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🛠️ Upgrade your ride with confidence—cool smarter, drive cooler!

LIGHTWEIGHT COMPACT - Weighs just 272g with a sleek 19x11x21 cm profile for easy installation and space efficiency.
PROUDLY AMERICAN MADE - Crafted in the USA, combining quality manufacturing with trusted performance.
VERSATILE POSITIONING - Engineered for front or rear placement, adapting effortlessly to your vehicle’s needs.
LIFETIME PEACE OF MIND - Backed by Dorman’s limited lifetime warranty, ensuring durability and reliability.
SEAMLESS UNIVERSAL FIT - Direct replacement designed to match original equipment perfectly, no modifications needed.

The Dorman 603-001 Coolant Reservoir Bottle is a universal, direct-fit replacement part designed to meet original equipment standards. Lightweight and compact, it fits front or rear positions and is backed by a limited lifetime warranty. Proudly made in the USA, it ensures reliable vehicle cooling system maintenance with hassle-free installation.

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Fit Type	Universal
OEM Part Number	0
Global Trade Identification Number	00019495081272
UPC	019495081272
Manufacturer	Dorman - OE Solutions
Product Dimensions	19.05 x 10.8 x 20.96 cm; 272.16 g
Item model number	603-001
Manufacturer Part Number	603-001
Position	Front, Rear
Colour	White
Assembly Required	No
Country of Origin	USA
Item Weight	272 g

Dorman 603-001 Coolant Reservoir Bottle

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