Multiple U.S. Warehouse LocationsBroken ApexFree shipping on qualified orders over $100*
The Mahle plain piston ring set is a precision replacement sized Napier THM-13 3.759 in x 1.2 mm with a .135in ring width and is packaged as a 48‑piece bulk pack for rebuilders and shops. These plain rings are intended to restore compression and control oil during engine overhauls, offering factory-style profiles and accurate sizing to help ensure consistent ring seating and manageable ring end gaps in piston rebuilds.
Mahle Rings Performance Napier THM-13 3.759in x 1.2MM .135in RW Plain Ring Set (48 Qty Bulk Pack)
