THERMWELL 1/2"F x 3/4"M 21-2 STEM Pacific Bay Equipment Sale! from $44.80 Qty. Add to Cart This item is currently on backorder but you can still purchase it now and we'll ship as soon as more become available. Temperature Gauges & Thermowells PSI: 2000 Collapse Protection 1.75" Immersion Length Stainless-Steel, 3/4" MPT x 1/2" FPT