Garrett AT Series 9 x 12" PROformance Waterproof Search Coil, Cover, Lower Rod & Hardware

The Garrett 9" x 12" PROformance is a waterproof concentric search coil compatible with the AT Pro, AT Gold, and AT Max, sold here as a complete kit with the coil cover, lower rod, and mounting hardware. AT series owners hunting large parks, sports fields, plowed farmland, and open shoreline reach for the 9x12 when the stock coil's footprint is the bottleneck, the wider elliptical face covers noticeably more ground per sweep and pushes depth on coin- and relic-sized targets in mild to moderate soil. The concentric winding gives a cone-shaped detection field that pinpoints tighter and returns cleaner target IDs than a DD in low-mineralization dirt, and because it ships with its own lower rod you can swap between coils in the field without unbolting anything.

What's Included with the Garrett 9x12 PROformance Coil Kit

• Garrett 9" x 12" PROformance concentric search coil for AT Pro, AT Gold, and AT Max
• Protective coil cover (skid plate)
• Lower rod
• Mounting hardware: bolt, washers, and nut

Why AT Pro, AT Gold, and AT Max Owners Reach for the 9x12

• More ground per sweep: the 9x12 elliptical face covers a wider path than the stock 8.5x11, which adds up over a full day on a plowed field or a ball diamond where site time is limited.
• Added depth on larger targets: the bigger coil pushes deeper on coins, buttons, and relics in mild to moderate soil that the stock coil reaches only at the edge of detection.
• Sharper pinpointing: the concentric cone field centers targets directly under the coil, so recovery holes stay small and precise compared to the double-blade response of a DD.
• Cleaner target ID in low-mineralization ground: concentric windings return more consistent VDI numbers in sandy loam, beach sand, and non-hot soil, which matters when you're digging by tone and ID rather than by ear alone.
• Fully submersible: hunt creeks, lake edges, and the wet-sand line with the same waterproof construction the AT series is built around. Pair it with the 5x8 DD Ripper for trashy sites and you have both ends of the coverage range covered.
• Complete kit, no cannibalizing: the included lower rod and hardware mean you're not swapping bolts between coils in a wet field.

Wider Coverage in Open Ground and Clean Soil

The 9x12 earns its keep where the ground is big and the trash is thin. On plowed farmland and pasture, the extra width per sweep means fewer passes to grid a section, and the concentric field's depth advantage on coin-sized targets shows up in the deep silver that the stock coil walks over. We've run this coil on old ball fields and picnic groves where the trash layer has already been worked, the 9x12 reaches under the picked-over top few inches and pulls wheat cents and silver from the eight-inch band.

Farm Fields, Pastures, and Cellar Hole Approaches

Open agricultural ground is the 9x12's home field. Sweep it slow and low with the AT Pro in Pro mode and the concentric response gives you a crisp, centered signal to pinpoint against, no double-peak guesswork before you cut the plug. On approaches to cellar holes where the iron density drops off, the coil holds ID stability well enough to sort brass and copper from the scattered nails.

• Best for: Plowed fields, pastures, large parks, sports fields, dry beach and shoreline, and any site with mild to moderate mineralization where coverage speed and depth matter more than separation.
• Less ideal for: Iron-infested relic sites, tot lots, and highly mineralized red clay or black sand, where a DD coil like the 8.5x11 PROformance or the 5x8 Ripper handles ground noise and target masking better.

Beach and Shoreline Detecting

Dry sand and freshwater shoreline suit the concentric design, mineralization is low, targets are spread out, and the wider face lets you cover a long stretch of beach before the crowds arrive. The coil is fully submersible, so wading a creek mouth or working the wet edge of a lake is fair game. Salt-saturated wet sand is the exception, heavy salt mineralization is where a DD coil will run quieter.

Large Parks and Sports Fields

Outfield grass, soccer pitches, and open picnic areas are typically low-trash by park standards, and that's exactly where the 9x12 outruns a smaller coil. The included skid plate takes the abrasion from turf, gravel edges, and infield clay so the coil face stays intact through seasons of dragging.

How It Compares to Other Garrett AT Series Coils

AT series owners generally cross-shop these coils on coverage versus separation, and on concentric versus DD. The table below places the 9x12 against the smaller concentric option and the stock-size DD.

Specifications

• Compatibility: Garrett AT Pro, AT Gold, AT Max
• Coil Size: 9in x 12in (22.9cm x 30.5cm)
• Coil Shape: Elliptical
• Coil Type: Concentric
• Weight: 1.5 lbs (680g) as shipped with cover, rod, and hardware
• Waterproof: Fully submersible
• Included Accessories: Coil cover, lower rod, mounting hardware
• Part Number: 2222700
• Country of Manufacture: USA
• Warranty: 2-year manufacturer warranty

Why Buy from Serious Detecting

Serious Detecting is an authorized Garrett dealer, so this 9x12 PROformance kit ships as a genuine Garrett accessory with the full manufacturer warranty and Garrett's US-based technical service behind it. Our team runs Garrett AT Pro, AT Gold, and AT Max detectors in the field and stocks the concentric and DD PROformance coils side by side, so we can tell you which one actually fits your dirt. Every order ships free, and our 30-day return policy and price-match guarantee back your purchase. Still deciding on size? Browse our full collection of metal detector coils or contact our team and we'll match the right coil to your machine and your sites.