
S4-FR4-LD
304 Stainless Steel, Locking Device, Used for 1/4 in. FR Series Metal Gasket Face Seal assemblies with Nut, to help prevent unintentional disassembly of FR connections

S4-FR8-LD
304 Stainless Steel, Locking Device, Used for 1/2 in. FR Series Metal Gasket Face Seal assemblies with Nut, to help prevent unintentional disassembly of FR connections