Marketing InformationFRIK Installation Kit simplifies your Radon fan installation job. The couplers help make a radon active soil depressurization (ASD) system installation quieter by providing superior vibration isolation.The kit includes: 2 anti-vibration couplers for 4 in PVC pipe fitting, easy read u-shaped manometer (with tubing and 2 self-tap screws), installation instructions, system and component labels, and a system information brochure. FRIK 4x4 is used with Rn1, Rn2, Rn2EC or any industry 4 in fans.