HOL-220-9003 This item is the spares kit for the Hollis Prism 2 Rebreather Spare Part Kit includes the following: (2) 22.010 Solenoid O-Ring (1) 22.028 Outlet Holder O-Ring (2) 22.125 Elbow Assembly/Counterlung OPV O-Ring (2) 22.126 DSV Barrel O-Ring (1) 22.128 Inlet Holder O-Ring (1) 22.130 Hose Outlet Adaptor O-Ring (1) 22.133 Scrubber Basket Inner O-Ring (1) 22.235 O-Ring (1) 22.239 O-Ring (1) 23.903 O-Ring (1) 23.904 O-Ring (1) 29136 DSV Barrel Mouthpiece Orifice O-Ring (2) 27765 Mushroom Valve (2) 29137 Main Canister O-Ring 4X165 (2) 29235 Counterlung O-Ring 3x41 (1) 28330 Breathing Hose (1) 28080 Diluent Addition Valve Gasket (1) 219045 Oxygen Addition Valve Gasket (1) 27810 Red CO2 Seal (2) 28333 Oetiker Clamp ***We suggest adding an extra MAV and ADV to your Kit***