Gauge adaptors and connection adaptors from the STAUFF Test 20 series with connection thread M16x2 with connecting threads G1/4, G1/2, 1/4 NPT, 1/2 NPT, 7/16-20 UNF and 9/16-18 UNF. Available in steel with zinc/nickel coating or in V2A and V4A stainless steel.