This spacer is used in the Standard Plastic High Sensitivity Nebulizer Complete Assembly for PinAAcle (N3160144), Organics Plastic High Sensitivity Nebulizer Complete Assembly with Tantalum Needle for PinAAcle (N3160152), Organics Plastic High Sensitivity Nebulizer Complete Assembly with Pt/Ir Needle for PinAAcle (N3160159), and the High Sensitivity Nebulizer Complete Assembly for AAnalyst 200/400/700/800 (N3150188).