Valves for self-installation - suited for all models from the 1847 Low-series (10 hole models: LG down to LLE); 3 valves for each length (18 pcs.) Valves minimize air loss when playing blow or draw notes. If both reeds of a corresponding reed pair are equipped with valves, the possibilities of bending the notes is very limited. If a valve is only closing the lower tuned reed of the pair then bending notes remains possible. On half-valved instruments the valves (=windsavers) must be attached onto the draw plate of 1-6 (the valve is situated on the inside of hole) and onto the blow plate of 7-10 (valve is situated on outside of upper plate). If you use superglue (gel) please let it dry out 100% as the solvent used in these glues are harmful.