Package: 8 sets of opener +8 group of screws Please look for "Dsmile" trademark!

Atrend 15LSV 15-Inch Single Vented Subwoofer Enclosure  (W) 32.00" x (H) 18.00" x (D) 19.00"   -  Vent (W) 3.00" x (H) 16.50" x (Deep) 16.00"  Gross Cu. Ft. 5.00 Net Cu. Ft.4.25 (Tuning 37Hz)  Speaker hole cutout 14.00"Speaker face is .75" Body is .75"Slot Vent with Spring loaded extra large termina...

Mineral deposits and hard water use can clog your Aqua-Life diffuser and produce less than adequate aeration quality. Keep your Aqua-Life aeration system running at peak efficiency by replacing hoses and oxygen diffusers on a regular basis.