Merit's PGU Series U-Clamp pressure gauges are designed to offer long lasting performance at an economical price. Available in 1.5", 2" and 2.5" dial sizes, each gauge is manufactured with a steel case, stainless steel ring, polycarbonate lens, brass or lead-free brass internals and 3%-2%-3% accuracy. Standard connections are 1/8" NPT or 1/4" NPT center back connection with available BSP or BSPT threads.