WA0037 Replacement spool cap for Worx WG184 WG190 WG191 WG168 Automatic Wire Feed Trimmer. WA0037 Spool cap for WORX, the lawn mower spool cap is made of high quality ABS for durability. The WA0037 WORX replacement spool cap protects the trimming line holding spool, preventing weeds from getting stuck inside and damaging the trimmer. WA0037 Replacement Lawn Mower Spool Cover for 40 Volt Models WG168 Weed and Lawn Mower, WG184 Weeder Parts, WG190 Wire Trimmer Parts, WG190 Wire Trimmer Parts. WA0037 Replacement Cap for use with WA0014 Trim Spool for Worx Replacement Parts. Easy to install, no tools required, snaps into place on the wire axis. Color: Black Material: ABS Package Contents: 4 * WA0037 Replacement spool caps are only the above package content, other products are not included. Note: Light shooting and different monitors may cause the color of the item in the picture to be slightly different from the actual item. Measurement tolerance is +/- 1-3 cm.