... -113 medium foot pumpModelHT-113SpecificationStandard Bellows Foot Pump(3L)4.5" , 5" , 8" , 11" , 14" , 16" ,19" , 20" for chooseSpecial interlock system to ... ;Various design for choose from: www.ykshengong.com;Foot Air pump apply to:air bed,air mattress,hovercraft &other large inflating ... the hose connection Double action air pump Means:pumps air on both up & down stroke 4.5''/ 5''/ 6''/8''/10'' Foot ...