3" Black Flexible PVC Pipe, 50' roll EasyPro Submersible Pumps (3100-17500 GPH) The pressure relief valve protects

The pressure relief valve protects the compressor from excessive  backpressure if there is some sort of blockage in the airline or diffuser

These heavy-duty white valves feature schedule 80 PVC construction with EPDM seals and seats and are rated to 150 PSI

It provides biological filtration for ponds up to approximately 1500 gallons and handles a maximum recommended water-flow of 40 gpm (2400 gph)

liner patch and 1 can of black foam

Also makes surface easier to clean in the future

3" Black Flexible PVC Pipe, 50' roll EasyPro Submersible Pumps (3100-17500 GPH) The pressure relief valve protectsThis industrial strength flexible PVC pipe is ideal for pond plumbing. It eliminates many fittings and increases water flow because of the lack of elbows. It is black in color, will not crack in freezing conditions, is flexible from 10F to 130F and can be used with standard PVC fittings. Because of the size of this product it can only ship via Motor Freight.