The Mueller W04017 3/4" Tee is a professional-grade wrot copper solder joint fitting engineered to ASME B16

Enhanced System Reliability: Prevents external leaks and protects sensitive internal sensor components from environmental degradation

When should this burner gasket be replaced

If the switch remains open or fails to close at 110°F

airtight seal between the blower flange and the housing to maintain optimal draft

Trane SWT1276 Limit Switch The Mueller W04017 3/4" TeeAs a seasoned tech, you know that keeping a furnace from over firing starts with a reliable safety circuit. The Trane SWT1276 is a professional grade 110 140F Auto Limit Switch designed to protect the secondary heat exchanger and surrounding components from thermal runaway. This OEM Trane replacement part features a fixed 140F high limit trip point and an automatic reset that closes the SPST normally closed (NC) circuit once the plenum temperature