From what I understand it's brass, so it's a soft material. However, after several adjustments trying to set the pressure, the screw stripped the brass threads. You should get the correct torque as there is another vent on the opposite screw size under the black cover. How tight you tighten the screw can affect the pressure in the regulator block. Like I said, it's very picky. I would recommend either buying a solid pressure model or looking for something else.
NANPU Air Drying System With Double Filters And Pressure Regulator Combo For Clean And Controlled Air Supply
18 Review
NANPU 3/8" NPT Compressed Air Filter Regulator Combo Piggyback, 5 Micron Brass Element, Poly Bowl, Semi-Auto Drain, Metal Bracket, 0-150 Psi Gauge
26 Review
NANPU Compressed Air Filter Regulator Combo: Brass Element, Semi-Auto Drain, 0-150 Psi Gauge, And More
21 Review
NANPU 1/2" NPT Air Drying System - 5 Micron Particulate Filter, 0.01 Micron Coalescing Filter, Air Pressure Regulator Combo - Semi-Auto Drain, Poly Bowl W/Metal Gauge
23 Review
🏠 Aprilaire 213 Whole House Air Filter: Advanced Filtration for Purifiers
10 Review
Nordic Pure Honeywell FC100A1037 Replacement
10 Review
🌬️ Nordic Pure 16x20x1 Pleated Air Filter 16x20x1M12 6 Pack - High Performance Filtration Solution
10 Review
🌀 Nordic Pure 20x25x4 Pleated Furnace Filter
10 Review