Products
| Part Number & Name |
| HM-4184.331 Lower Stone (Fixed & Permeability) Porous Stone, 3.31″ x .25″ (84mm), Lower Fixed and Permeability |
| HM-4184.4375T Lower Stone (Fixed & Permeability) Porous Stone, 4.375″ x .5″, 100mm, Lower Fixed and Permeability |
