Slimline style is ideal for limited space situations. Durable cast iron top and base with aluminum bases available. Machined top and base with a Buna N “O” Ring provide a vapor tight seal. Air flow at 2.5psi is 91,076 SCFH for 4” with screen and 227,191 SCFH for 6” with screen. 4” or 6” NPT female thread is standard.