Can i run a rv antifreeze insted of water to prevent freezing?

NO, has to be water. It's not used to prevent freezing, not for melting

What is the beam radius and divergence?

Hi, dear. The beam radius is about 1.5mm.

I got this tube and it is 4 inches longer than my original will it still work for my machine?

If this fits in your machine you'll need to make sure the power supply matches up to the power requirements of the tube. Without any other information it seems like you have the wrong tube.

I had issues with pre-wired tubes that there would be arking where the two lines are spiced together. What is the proper way to avoid this?

I didn't have that issue with this tube. Arcing suggest poor connection. Make sure you have a good amount of bare wire . If your still worried, you can solder the connection. Make sure to insulate the connection.

Manufacturer	SenTECH
Part Number	LASER-Tube-80W-1250-Ameri
Item Weight	13.37 pounds
Package Dimensions	56.5 x 10.8 x 9.3 inches
Size	80W 1250mm
Style	Laser
Material	Glass
Batteries Included?	No
Batteries Required?	No

SenTECH 80W CO2 Glass Laser Tube 1250mm Length Dia 80mm for Laser Engraving and Cutting Machine (Buy More Discounts)

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