Patterson-Kelley 26-4000-0128 Ignitor THPU32HP7Y This reverse acting unit features

This reverse acting unit features a 0 to 10 molded plastic dial indicator

ensuring reliable performance in air proving for electric duct heaters

While often categorized as a universal ventor wheel in some technical cross-references

Is the SWT1277 interchangeable with a manual reset switch

Patterson-Kelley 26-4000-0128 Ignitor THPU32HP7Y This reverse acting unit featuresThe Patterson Kelley 26 4000 0128 Ignitor is a critical high precision component engineered specifically for commercial boiler ignition systems. Designed for use across the Patterson Kelley Mach and P K Compact series, this direct spark ignitor ensures consistent electrode gapping and reliable arc generation in high demand hydronic applications. Veterans in the field recognize this assembly for its robust ceramic insulation and high temperature alloy