Here are the pics and specs:

showing how well it fits into a 4inch fitting


Type: O-Ring
O-Ring Type: Standard
Cross Section Shape: Round
Width: 3/16"
Actual Width: .210"
Inside Diameter: 4"
Actual Inside Diameter: 3.975"
Outside Diameter: 4-3/8"
Actual Outside Diameter: 4.395"
Material: EPDM (Ethylene Propylene)
Durometer: Hard
Durometer Shore: Shore A: 70
Temperature Range: -65° to +212°F
Color: Black
If you are interested I will send you one for $2.00. The $2.00 includes me putting it in an envelope and mailing it to you with stamps. Send me a PM with your address and I will give you my paypal, once I receive the money I will ship it out to you.