Filter unit, bottle top; Millipore Steritop-GP 150mL Express Plus PES .22um 33mm RS 12/pk: 64.98: SCGPS05RE: Filter unit, bottle top; Millipore Steritop-GP 500mL Express Plus PES .22um 33mm RS 12/pk: 92.72: SCGPT10RE: Filter unit, bottle top; Millipore Steritop-GP 1000mL Express Plus PES .22um 45mm RS 12/pk: 141.79: SCGPU01RE