AQUASPEC ASPF SERIES TOP MOUNT PE PLASTIC SAND FILTERSASPF Plastic Top Mounted Sand Filters Features Transparent lid cover allows easy inspection of the sand bed Top diffuser ensures even distribution of water over the top of the sand bed Air relief enables easy release of trapped air during operation of the filter Easy to use multiport valve lets you select any of the valve filter operation with a simple lever action Working Condition Max Working Pressure: 200kpa 28psi 2. 0bar Factory Testing Pressure: