Lasco 13-1891 Gas Test Gauge, 0 To 15 PSIGas test gauge 0 to 15 PSI with 3 4 inch female pipe adapter with air valve, used to test gas pressure. 0 to 15 PSI Gas test gauge With 3 4" iron pipe size threads Used to test gas pressure Carded. WARNING: This product can expose you to chemicals including Lead which is known to the State of California to cause cancer or birth defects or other reproductive harm. For more Information go to www. P65Warnings. ca. gov