We originally designed these fittings in 1987. All of our Thru Frame Fittings are made from Stainless Steel with a Stainless Steel Nut  They have 3/4" of threaded area to adjust to different frame sections and are available with 1/8" NPT Female on both ends, which allows you to use various fitting combinations. You can  use a 90 degree fitting off the end on the outside and only use 1" of space, instead of using 1 1/2" to 2" of space like other brands when needing a 90 off the fitting.

2380      1 1/2" to 2"  Thru Frame         $32.00 pair
2390      2" to 2-1/2"  Thru frame          $36.00  pair
2400      2 1/2" to 3"   Thru frame         $50.00  pair

With 1/8" NPT female on each end

Sold in package of 2 each