... BSP or BSPT dependent on model & size. Bottom, backleft & right side connectionAVAILABLE RANGES:30Hg "- 0-15-15000PSIWINDOWS:Acrylic, glass & ... BSP or BSPT dependent on model & size. Bottom, backleft & right side connectionAVAILABLE RANGES:30Hg "- 0-15-15000PSIWINDOWS:Acrylic, glass & ... % accuracy, recalibrators,restrictors, special connections and more. Back Connection Steel Case Gauge 4Z2