WirthCo Funnel King Push-Style Grease Gun with Hydraulic and Flush Coupler is designed to get grease into tight spaces. The piston-style construction allows one-handed operation. You simply hold the barrel and push down to dispense grease (not included). This grease gun features both standard hydraulic and flush style couplers. The plastic barrel measures 8 inches in length and has a capacity of 2.5 ounces/80 milliliters. For over 30 years, WirthCo has been a prime manufacturer of practical products for making life easier and safer. California Prop 65 - Warning, This product contains chemicals known to the State of California to cause cancer, birth defects or other reproductive harm.