Sintered cap 21 mm diameter$76.00 For Testo Models 445, 645, 6740 Call us for a quote Product Model: 0554 0640 Sintered cap 21 mm diameter quantity Add to cart SKU: 0554 0640 Category: Testo Sensors Parts & Accessories Tag: Testo Sensors Parts & Accessories Description Description For Testo Models 445, 645, 6740 Related products Self service replacement O2 sensor – 305/325M & XL0 out of 5 $90.00 Add to cart Replacement thermocouple for probe 0600 9542 (325)0 out of 5 $180.00 Add to cart Telescopic handle for plug in vane probes0 out of 5 $396.00 Add to cart