M21E is the designation for model M21 with a Grade E EPDM gasket. The VSH Shurjoint Model M21 features an advanced design and when mounted on hole cut pipe the Model M21 provides a fast and easy mid-pipe threaded branch outlet. Threads are NPT per ANSI B1.20 or BSPT per ISO 7. By utilizing the Model M21 you can eliminate the need for welding or the use of multiple fittings. The M21 Mechanical Tee is com­prised of upper and lower ductile iron housing segments, a grade “E” EPDM rubber gasket (Model M21 & M22 gaskets are interchangeable) and plated track bolts and nuts.Mechanical tees are supplied with our standard painted finishes, i.e. orange or red. Optional finishes such as hot dipped zinc galvanized and custom epoxy coatings are also available.