Available in 1/4" NPT or 1/2" NPT connections, Merit's brass test plugs are ideal for installations that require a permanent, sealed access point for temperature or pressure measurement. Made with a forged brass body and a self-sealing Buna N (NBR) core, our test plugs have a temperature rating of -40/302 F (-40/150 C) and a maximum pressure rating of 1,000 psi. Also available in lead-free brass upon request.