Manufactured with stainless steel all thread rod, a stainless steel axle, and a UV protected rubber roller the MAPA roller assemblies provide an excellent accessory to the MAPA Bridging Systems and Strut Support when installing natural gas piping along a common corridor with other piping.  The MS-3A5 utilizes a strut nut to attach the assembly to the support whereas the MS-5A5, 8A5 and the 10A5 utilizes SS 1/2" nuts, bolts and washers.