4-Lug replacement gasket, Black SBR rubber blend, same as the standard one that comes in each coupling.  These are sold individually.  Fits 4-Lug couplings 1-1/4 through 2 inch NPT or hose diameter.  

• -20 to +160 Deg F Range - Black SBR
• Price is per unit, no package quantity

SBR = Styrene-butadiene synthentic rubber blend