EX24235 HeatLink 1-1/4 in PEX F1960 Expansion Ring 1-1/4" PEX-a expansion rings with 360 degree stop collar for use with PEX F1960 fittings.ASTM F1960 compliantMade of PEX-aComes with stop so the ring doesn't slide during expansionExtruded process results in even expansion