1.5" Coupler (White) Pack of 4 compatible with Ceiling mount SBP-140CMB, SBP-180CMB, SBP-180CMS Hanging Adaptor SBP-099HMW, SBP-120HMW, SBP-140HMW, SBP-160HMW1, SBP-180HMW1, SBP-200HMW, SBP-250HMW, SBP-315HMW, SBP-156HMW