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.

Dorman 603 001 Coolant Reservoir Bottle

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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¥17908

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Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛠️ Upgrade your ride with confidence — the last coolant reservoir you’ll ever need!

TRUSTED BY THOUSANDS - Rated 4.5 stars by over 2,300 customers, join the community of drivers who trust Dorman for quality and performance.
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, weighs only 272 grams for easy handling, and is backed by a limited lifetime warranty. With over 2,300 positive reviews and a 4.5-star rating, it’s a trusted choice for professional-grade vehicle maintenance.

Specifications

ASIN	B000E35UV2
Brand	Dorman
Brand Name	Dorman
Customer Reviews	4.5 out of 5 stars 2,392 Reviews
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	272 g
Item dimensions L x W x H	19.1 x 10.8 x 21 Centimeters
Manufacturer	Dorman
Manufacturer Part Number	603-001
Manufacturer Warranty Description	Limited Lifetime Warranty
Material	Plastic
Material Type	Plastic
Model	603-001
OEM Equivalent Part Number	0
Product Grade	like new
UPC	019495081272

Reviews

C**O

7.08.2023

B**Z

27.08.2025

J**S

28.04.2026

R**K

23.11.2025

C**R

4.06.2025

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