Sks hirschmann 4mm sliding sleeve sls plugs 20 b 16a sks hirschmann 931 825 102 blue sks hirschmann sls 20 b sliding sleeve banana plug insulated by a locking and spring mounted insulation sleeve the sleeve is only released by putting pressure on the lateral locking springs sks hirschmann 931 825 102 4mm sliding sleeve sls plug 20 b dc 16a blue