I installed a 2" ball valve and 2" pvc tee to control the air volume from the Jandy Spa Air Blower PSB215 to the spa. The bled air allows you to adjust the right amount of air bubbles you desire in the spa but the bled air creates noise as a result. I've been successful to reduce this acoustic noise by installing a muffler which I bought on Amazon for $25, see link: Parker ES100MC Aluminum Exhaust Silencer, 1" NPTF, 1013 scfm Flow, 2.01" Diameter x 4.56" Length, 250 psi: Compressed Air Pneumatic Mufflers: Amazon.com: Industrial & Scientific . I installed 2 mufflers but actually 1 muffler was sufficient.
