1 x DOOST D600SK Seal Kit pack of 5.
Part Number:- GL1256 DOOST D600SK Seal Kit
Manufacturer:- DOOST Engineering
This is a replacement seal kit for a DOOST D-600, you will receive a pack of 5 seals.
A seal will need to be replaced once you find the coupler does not seal whilst in use, there are many reasons for the coupler not to seal such as grit getting in the coupler.