Tailpiece, Heater, 2 1/2"mbt x 2" Slip

This part is a Heater Tailpiece, 2 1/2"mbt x 2" Slip..

The threaded side measures about 3 5/8" edge to edge and the Slip side measures about 2 3/8" Inside Diameter.. 

For the gasket that works with this Union click this Link: 2 1/2" Spa Hot Tub Heater Union Therm T Gasket Blue Ridge Gatsby Video How To

Heater Union Part Type    Tailpiece
First Plumbing Connection Size    2", 3"
First Plumbing Connection Type    Male Buttress Thread (mbt), Slip (s)
Second Plumbing Connection Size    2", 3"
Second Plumbing Connection Type    Male Buttress Thread (mbt), Slip (s)