Attwood Primer Bulb - 5/16" Inner Diameter Hose [93516LP7]Primer Bulb 5 16" Inner Diameter Hose This Atwood Primer Bulb is engineered and constructed to deliver the most reliable priming and long term leak free performance. The exclusive three layer construction prevents collapse under vacuum and prevents ballooning or bursting under pressure. The low permeation material prevents fuel evaporation, and this bulb delivers 60 percent more output per pump than leading competitors. Features: It is intended for