T9.9. What is this box for?

[rakos000]

Hi. What is the square box attached to intake manifold? Two pipes enter from crankcase, one pipe exits at 'pisser' hole. Anything go in it? Thanks

[99yam40]

part number or maybe a pic would help
along with the model # of the motor it is on

[boscoe99]

There are many many many different T9.9 models. What is the complete model of the motor in question.