This flanged port assembly with cap allows you to create a 3-1/4" diameter port in an existing rigid tank of any material.
This opening is just large enough for most people to pass their hand through.
If you need to reach any distance into the tank, this port is probably too small.
• Flange OD - 5-9/16"
• Flange Cut-Out - 4"
• Internal opening - 3-1/4"
• Includes gasket
• Flange is secured to the tank, from the underside, with included fasteners