Sealing seat requires flat washer
IMPORTANT: Government Regulations For Test Point Adaptors
TEST POINTS REQUIRED ON GAS SYSTEMS
When gas is supplied for the first time or by a new supplier, the gas supplier must ensure that a test point is located on or immediately downstream from the regulator. This should be used to test for leaks and to pressure test the system.
Test points are compulsory in Queensland and Western Australia*. (correct at time of printing)
Source: Queensland Government (Department of Mines, Resources and Water), 2006, ‘Test points are now required on gas systems,’ Petroleum and Gas Safety News, no. 13, Feb, p.5.