Male Adapter, 4" Black Flexible PVC Pipe 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

Liquid Barley Straw Extract is an all natural product for Koi Ponds & Water Gardens that is derived from a fermentation of barley straw

filtration media and more

but stick with it and after the 2nd or 3rd treatment results should be noticeable

but it is preferred by many for its amazing ability to trap small debris

Male Adapter, 4" Black Flexible PVC Pipe The pressure relief valve protectsAll PVC Fittings are not the same! Unlike many available at department stores, our high quality fittings have deep sockets that allow for maximum bonding area, which is especially important when gluing Flexible PVC Pipe. This is a schedule 40 PVC Male Adapter used to adapt PVC pipe to female threaded fittings.