Do you know the name of this part?

[KOOSER55]

This is a picture of the inside of the water box on my Hydramaster maxx 470. The elbow price at the top where the float attaches has a hairline crack. So when the float goes up the crack continues filling the box and causing it to overflow into my trailer

 

[FredC]

Float valve

http://www.jondon.com/ea-float-valve-assy.html

you can likely find just the valve locally much cheaper

 

[BradFenstermaker]

Roberts float valve. Call local plumber supply

 

[KOOSER55]

Thanks guys I really appreciate it !