Twin Probe Keg Coupler with Stainless Steel Probes Twin Probe system is no longer in use by any major brewey. It is in limited use by some regional craft breweries. Do all brands of beers use the same keg tapping equipment? Beer Keg Tap Features: Stainless Steel Probes Specifications: SystemTwin Probe (Hoff-Stevens) ProductsLimited Micro-Breweries