9/16×24 INTERNAL THREAD (MOST .40 CAL) 13/16″-16 THREAD PITCH (FITS PH5 AND SIMILAR FILTERS) THREAD PROTECTOR INCLUDEDOil Filter Solvent Trap Adapter 9/16x24$49.99PriceQuantity*Add to CartLEGALNOTE: IT IS ILLEGAL TO USE THIS PRODUCT AS A SOUND MUFFLING DEVICE, SILENCER, SOUND SUPPRESSOR ETC. PLEASE FOLLOW ALL FEDERAL AND LOCAL LAWS.