The Thru Tube Mounting Connection Kit consists of a stainless steel nipple with air inlet holes and two special EPDM rubber gaskets. The gaskets provide a seal and also serve as a bushing to hold the assembly in the center of the air piping. The stainless steel nipple joins the two diffusers to complete the connection. The kit is designed to mount T-Series diffusers to square or rectangular air piping. Reference the diffusers in the T-Series section to select the proper diffuser for your application. Call for part number and pricing. Specify the air piping cross section dimension as well as the diameter of the outlet holes.