Kent-Moore Tools Kent-Moore J-21867-50 Adapter, Transmission Pressure For General Motors. Accurate checking of transmission oil line pressure is critical in the diagnostic troubleshooting process. J-21867-50 consists of a special banjo adapter, special bolt with washer seals and a quick connect fitting that adapts the previously essential J-21867 Oil Pressure Gauge to the AF40-6 transmission pressure test port. Email for product availability.