sap ladder

[cur dog]

I'm working on finishing up my new system. Try as I might, I'm forced to put in a sap ladder. It will have about 40 taps on it, and be transfering between two 3/4" lines. How many spiders will I need to handle this number of taps? Would adding an extra spider help "transfer vacuum" to those 40 taps? Thanks for any input.

[Maplewalnut]

One 6 way spider will be enough. Rule of thumb is one spider leg for each 10 taps. I have had success with up to 15 taps per leg with minimal vacuum loss.