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Dale I sent your question to TFT and this is the response I received back from them;
Hope this helps you,i didn't change anything from their email;
The size of the ball is really pretty insignificant as it does not affect the overall flow capabilities of the valve and it is not a full ball. Technically, we say the ball has a 5.5" diameter. It is the 3.65" waterway at the seat that makes the difference. The jumbo series of intake valves have a 5.25" waterway at the seat.
Capt Georgetown Fire Dept.
Captain, . Technically yes, you should be able to get the capacity of the pump but it will be close. The New Force BIV is a 3 5/8" opening, so you will be working the pump hard. Another issue with this valve is that it has a fixed position elbow which could make it difficult to attach your suction tubes.
If you were looking for a better recommendation I would suggest the Jumbo BIV as that has a 5 ¼" opening and a swivel elbow which will make it much easier to attach your tubes.