NHRA approved Puke Tanks for TAD

At one time I seen posted here that the Puke Tank had to be NHRA approved? When I reviewed the rules I do not see this in the rule book. Does any one know for sure weather it has to be approved by NHRA or we just have to follow their specs?

 

approved?

Jim Collins has stated that any ole' 6 3/4 gallon tank won't be accepted. That propper design and internal baffeling will be required. Also, minimum 1 1/4" inlet connections.
Anyone can build one, but if it is not of a pre-approved design, it will probably be thoroughly inspected.
Good luck,
Marty