This PTFE Chimney works on 3CX3000A7 transmitting tube. The Chimney has 5 tapped screws to mount to Chassis. Tube slides through chimney for mounting to base (IE: SK14B, etc).
Dimensions: 4.475" Diameter x 2.3" High. 4.13" ID for top fins of Tube and 3.73" ID for base of tube to fit. Tube fits snug in Chimney to allow for good air flow.
Limited Quantity Available. (Tube not included -- picture for reference only)