Don't waste your money on the "silencer kit" just get the Seaflo pump.
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Hopefully you see this video before blowing your money on the Shurflo pump like I did.

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Seaflo 33 series pump: https://amzn.to/2NQErFf

00:00 Intro
1:28 Shurflo dB
6:35 Shurflo “silenced” dB
7:42 Shurflo v Seaflo
12:32 Seaflo install
15:01 Seaflo dB
15:29 Noise comparison
16:20 Cost comparison