• 3.25 inch silicone purge plugs with diffusers for back purging stainless tubing and pipe. 
• They are made of a non-toxic high temp silicone and can handle temps up to 600 degrees F. 
• Has a 1/4 inch brass hose fitting.
• Made in York, PA. Any questions please ask. Free S/H. 
• Green - Small End = 2.677" Large End = 3.228" Height = 1.500"
• They will fit Schedule 10, 40 and 80 on 3 inch pipe.