Ports protrusion mounts, made to mount to the speaker box and the port pipe passes through this mount, these are 3d printed from PETG and made heavy duty, available in 3,4,6,8 and 10" sizes, fits all schedule 40 pvc and can be bonded with pvc cement, weld-on #3,#4 and #16
THESE ARE NOT FOR PLUMBING, THESE ARE FOR SPEAKER BOXES.
MADE IN THE U.S.A.