Brinkley 3500 Blacktank External Dump Value for Blacktank?

I’m trying to find a manual external dump valve for the two black tanks in 3500. Any recommendations would be awesome?

Like this?

https://www.amazon.com/gp/product/B000BGHYJS

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Yea i have one on my travel trailer and just ordered 2 for my 3950. I hate the suprise splash, even when i know its comimg.