Very Rare: Only use for 3/4 or 19mm reach WASHER SEAT spark plugs. Washer seat plugs are used mostly on foreign vehicles, if you have a Domestic vehicle with taper seat plugs in need of a triple oversize repair see our 5600 kit. Be aware the external diameter of the large insert is 20mm check to see if you have clearance around your valves. This kit will repair holes as large as .730 inches by installing two inserts one insert inside the other. Qty Kit includes 1 M18 Wrench Triple oversized 1 Optional Counterbore for RF-1L2E - 55518 Setting tool with ring 1 M18 Reamer Triple oversized 1 M18 Tap Triple oversized *Note this is NOT a standard M18x1.5 it's oversized. 1 M18 Driver Triple oversized 5 M18 Inserts Triple oversized PN 55522 (measures approximately 3/4" OD) 5 M14x1.25 insert fully threaded washer seat PN 51407 1 M14x1.25 driver tool 1 Oil (J-42385-110) 1 Loctite Sealer 1 1/8 hex key small 1 3/16 x 6” hex key long 1 Case

See the our spark plug thread repair, common questions and answers. We answer questions about doing this repair over the fender and more in the following short series of FAQ's.