What is the Exterior Diameter? of the threads?

I did not measure mine but, it fits a standard, 3 inch ABS fitting perfectly. I used it to install an RV sewer connection on my home plumbing to my septic system.

Will this hook into a 3 in cleanout?

As you can see the tabs on the fitting. They are where the drain hose will connect. Your camper must have a female fitting to screw this into, otherwise you’ll need a female adaptor for this to work.

Will a camco 39666 hose lock on to this fitting

Yes, the Valterra termination adapter should fit with your hose. It is the standard 3" bayonet size.

Does a version of this exist with a female thread end?

Sure if I have a reliable answer

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Valterra - 1216.1011 T1029-4 Termination Adapter - 3" Bayonet x 3" Male Thread

Product ID: 314140074

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Details

Material
Brass
Brand
Valterra
Colour
Black
Item dimensions L x W x H
16 x 16 x 12
Connector type
Adapter

🔗3" Bayonet connection

⚙️Universal fit compatibility

🛠️3" Male threaded end

Description

🔧 Connect with confidence — the ultimate adapter for pros on the move!

UNIVERSAL FIT DESIGN - Versatile adapter for multiple plumbing setups
LIGHTWEIGHT COMPACT - Easy to handle and install without bulk
DURABLE BRASS EXTERIOR - Built to last with corrosion-resistant strength
PRECISION 3 MALE THREAD - Engineered for a tight, leak-resistant fit
SEAMLESS 3 BAYONET LOCK - Effortless, secure connection every time

The Valterra T1029-4 Termination Adapter features a 3-inch bayonet end paired with a 3-inch male threaded end, crafted from durable brass for long-lasting performance. Designed for universal fit, this lightweight and compact adapter ensures secure, leak-resistant connections in plumbing, RV, and pool systems.

Specifications

Manufacturer	Valterra Products LLC
Brand	Valterra
Model	T1029-4
Product Dimensions	1.57 x 1.57 x 1.17 cm; 90.72 g
Item model number	1216.1011
Exterior	Brass
Manufacturer Part Number	1216.1011
Item Weight	90.7 g

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