How much to add?

[Rocky998]

Odd, my Python has a standard 3/4" Female hose connector at the tube end of the gravel vac.

Yours was probably the kit thing then... I just got the siphon itself.

 

[Back in the fold]

Just when you think you know it all @Byron and @Colin_T come along and settle the matter. Posts # 41 and 43 should be printed out and hung on your fish room wall.