Pressure tight screw connector 1/2G with teflon ring 6 bar (87 PSI) max. Valid for 0555 6600 series probes.$197.00 For 6621, 6651, 6681 Call us for a quote Product Model: 0554 1796 Pressure tight screw connector 1/2G with teflon ring 6 bar (87 PSI) max. Valid for 0555 6600 series probes. quantity Add to cart SKU: 0554 1796 Category: Testo Sensors Parts & Accessories Tag: Testo Sensors Parts & Accessories Description Description For 6621, 6651, 6681 Related products CO Sensor 0-4000 ppm0 out of 5 $176.00 Add to cart Self service replacement O2 sensor – 305/325M & XL0 out of 5 $90.00 Add to cart CO replacement sensor (0-10000 ppm H2 compensated)0 out of 5 $1,122.00 Add to cart