Eliminates the need for pipe nipple on installation. Hole patterns conforms to ANSI B16.5 specifications. Machined base and top with Buna N "O" Ring provides vapor tight seal. Air flow at 2.5 psi is 448,054 SCFH for the 8" and 672,108 SCFH for the 10", both with screens.
SCFH = Standard Cubic Feet Per Hour @ 2.5psig