Z1 Down River Equipment 4" Barrel PumpDRE pumps have a 1" diameter x 6' long Tigerflex non collapsible hose with an aluminum nozzle designed to fit most standard inflation valves. These pumps comes standard with check valves (military valve compatible). There's a spare O ring in the bottom of each pump cylinder. Urethane reinforced base to increase durability. Foot plate and plunger disc are both made out of high density polyethylene. Foot plate has two 1" cam strap holes for securing