Check the listing for details. Aqua Select Swimming Pool Pressure Gauge ¼" Side Mount Compatible For All Brands. Condition: New. Listed at 10.91 USD. Aqua Select® Swimming Pool Above Ground In-Ground ¼" Pressure Gauge - Side Mount Item Number: 274140 This pressure gauge serves as a suitable replacement unit for any pool filter (sand, cartridge or DE) that requires a side-mounted pressure gauge. The pressure gauge accurately measures the pressure inside your filter tank, which steadily increases as the filter takes in more and more debris. When the pressure of your filter has increased by 8-10 psi from your Starting Pressure, it's time to backwash your filter or clean your cartridge Features: SIDE MOUNT OR TOP MOUNT - The Aqua Select Pressure Gauge serves as a suitable replacement unit for any pool filter (sand, cartridge or DE) that requires a side or top mounted pressure gauge. Note: the pressure gauge may look different than the image. ACCURATE READING - The pressure gauge accurately measures the pressure inside your filter tank, which steadily increases as the filter takes in more and more debris. PRESSURE GAUGE TIP - When the pressure of your filter has increased by 8-10 psi from your starting pressure, it's time to backwash your filter or clean your cartridge. EASY TO USE - Easy to Install. Works with Most Major Brands with Suitable Connection. MANY USES - Ideal to Use for Swimming Pools, Spas, Hot Tubs, Aquariums and any Other Water Systems. *NOTE - STYLE MAY VARY*