The Nikon WP-G1000 Silicone Grease for WP-N1 Waterproof Housing is used to lubricate the O-ring on WP-N1 Waterproof Housing for Nikon 1 J1 or J2 digital camera with 10-30mm VR lens. It keeps the O-ring from drying out to maintain effectively the water tight properties of camera housing.Features: Lubricates the O-ring on your WP-N1 Waterproof Housing for Nikon 1 J1 or J2 digital camera with 10-30mm VR lensKeeps the O-ring from drying out, which is vital to maintaining the watertight seal that protects your camera while inside the housingServes as a replacement or spare for the grease that came with your housing