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, White Universal Fit

Product ID: 286008679

Details

Brand
Dorman
Exterior finish
Machined
Item dimensions L x W x H
19.1 x 10.8 x
Material
Plastic
Vehicle service type
Universal

🔧3 mounting holes for flexible installation

⚙️Universal fit for versatile use

🛡️Thick wall heat & vibration resistance

R1458

Duties & taxes included

In stock

Sold byAmazon South AfricaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

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

DURABLE CONSTRUCTION - Thick, high-quality plastic walls engineered to endure heat and vibration.
EXPERT SUPPORT INCLUDED - ASE Blue Seal Certified technical help whenever you need it.
UNIVERSAL COMPATIBILITY - Fits a wide range of vehicles effortlessly, eliminating guesswork.
INSTALLATION FLEXIBILITY - Three strategically placed mounting holes for easy, secure setup.
TRUSTED AMERICAN QUALITY - Backed by over 100 years of automotive aftermarket expertise.

The Dorman 603-001 Coolant Reservoir Bottle is a universal-fit, durable plastic coolant tank designed to withstand heat and vibration. Featuring three mounting holes and a vented cap, it offers flexible installation and reliable performance. Proudly designed in the USA and supported by Dorman’s ASE Blue Seal Certified technical team, this reservoir is a trusted choice for professional-grade vehicle maintenance.

Specifications

ASIN	B000E35UV2
Automotive Fit Type	Vehicle Specific Fit
Best Sellers Rank	#9,806 in Automotive ( See Top 100 in Automotive ) #7 in Automotive Coolant Recovery Kits
Brand Name	Dorman
Compatible with Vehicle Type	Universal
Customer Reviews	4.5 4.5 out of 5 stars (2,434)
Exterior Finish	Machined
Fit Type	Vehicle Specific
Fuel Type	Gasoline
Global Trade Identification Number	00019495081272
Included Components	1 Coolant Reservoir, 1 Cap
Item Dimensions	19.1 x 10.8 x 21 centimeters
Item Part Number	603-001
Item Type Name	Coolant Reservoir
Item Weight	272 g
Manufacturer	Dorman Products
Manufacturer Part Number	603-001
Material Type	Plastic
Model Number	603-001
Number of Items	1
OEM Equivalent Part Number	0
Part Interchange Info	603-001
Product Grade	like new
UPC	019495081272

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