Ports with mounting flange for mounting to the speaker box, these are 3d printed and made heavy duty, available in 3,4,6,8 and 10" sizes, fits all schedule 40 pvc pipe and can be bonded with pvc cement, weld-on #3,#4 and #16. Sizes 3,4,6 and 8" are a 1 piece design, 10" is a modular assembled design.
THESE ARE NOT FOR PLUMBING, THESE ARE FOR SPEAKER BOXES.
MADE IN THE U.S.A.