The pump output section has a bent screw that is removable. Inside, there is a white cross rose to adjust the amount of oil. This machine operates quietly. Features: - Removable bent screw design - Cross rose allows adjustment of oil flow - Operates extremely quietly - Designed for use with smoke machines - Available in 30DCB and 40DCB models - Constructed from high-quality materials, durable and compact Specifications: - Main material: Stainless steel - Model: 40DCB; 30DCB (optional) - Voltage: 110V–120V - Light source power: 18W - Protection class: IP40 30DCB: - Item weight: 115g / 4.06oz - Package weight: 125g / 4.41oz 40DCB: - Item weight: 130g / 4.59oz - Package weight: 140g / 4.94oz - Item dimensions: approximately 10 x 3 x 2cm / 3.94 x 1.18 x 0.79in - Package dimensions: 15 x 4 x 2cm / 5.91 x 1.57 x 0.79in Notes: - 30DCB is compatible with 400W smoke machines only - 40DCB is compatible with 900W smoke machines only - Color is delivered at random Package includes: - 1 x Smoke machine oil pump