This kit consists of Stainless Steel Thru Frame fittings with -3 AN on the outside to 3/16 female inverted brass on the inside, as seen in the picture.

2440            1 1/2" to 2"   Thru frame
2450             2" to 2-1/2"  Thru frame
2460             2 1/2" to 3"   Thru frame

Sold in package of 2 each.