3DReeF 1/2 inch Bulkhead with 2x 1/2inch Flow Generator Locline unit .It generates a Random Flow pattern in your aquarium..Suited to install with 1/2 inch hole in the glass and a 16 mm internal hose diameter. Easy to install. Available in 3 main colours Black,Neon green and Neon orange.Both Neon colours glow below Uv light. IMPORTANT this device is to only be used in aquariums with internal sumps or rear sumps ,not to be used outside of aquariumglass as it is 3dprinted and cannot be garanteed to be totaly 100% water drops proof. We are adding listings as time permits us but we can make any kind of locline if you have a special request just send a pm and we will create a listing specialy for you.