Penn Plax Check Valve and Air Filter, 9 count Dog First Aid Wellness These 2" Diameter mineral wheels

These 2" Diameter mineral wheels have a small hole drilled in the middle and can be used as a replacement for your currently mineral block wheel or can be placed directly in the bottom of the cage for your pet

1" x 15" x 20"

The cultures inside of Nite-Out II will establish

Reduces Sludge Buildup

Penn Plax Check Valve and Air Filter, 9 count Dog First Aid Wellness These 2" Diameter mineral wheelsThe Penn Plax Check Valve Air Filter is perfect for use with all aquarium air pumps. The Penn Plax Check Valve Air Filter stops water from siphoning into your air pump in the event of electrical power failure or when removing filters from aquariums. Protects pump against water damage Supplies clean air to aquarium Suitable for use with all aquarium air pumps The check valves aquarium side connector can fit standard or mini airline tubing. Installs