The Pentek 3G IB 150550 water filter housing has an integrated bracket so a separate bracket does not need to be purchased.
Connecting two #10 Standard Housings:
Two #10 Standard housings can be connected with a pipe nipple or pipe union. There are several pipe nipples available that can be used to connect two #10 Standard Housings. See all combinations of pipe nipple options here.
NP-34 - Use this pipe nipple to connect two #10 Housings with 3/4" Inlet/Outlets
Pentek 150550 3G SlimLine Housing Specs:
Inlet/Outlet: 3/4" NPT
Maximum Dimensions: 13-1/4" x 5-3/4" (337 mm x 146 mm)