Charlene63, I don't know if I've recommended this 3" plug to you or not before, but try it if you really want 3 inches inside you:
http://siliconenozzles.com/SPD30-3-Inch-Diameter-Super-Retention-Silicone-Nozzle-SPD30.htm
@Charlene63 Not sure exactly where WildBill's other reply is, but I wanted to chime in that I heartily agree. Though I had used 3+" diameter/10+" circumference toys prior, under optimal conditions and arousal, I purchased the SPD30 in order to not only combine a stretch with enemas, but the abrupt jump to the neck looked like a great seal. I purchased it in black, 30 firm, and 1/4" bore. 30 firm is indeed quite firm, but the high quality silicone and lengthy taper treats my anus to a wide, yet gentle stretch. Once it pops down to the neck, it's quite eye opening and the seal is excellent. There's also two other options in that size that weren't available when I purchased mine:
http://siliconenozzles.com/CONCAVE-SPD-3-Retention-Style-Silicone-Nozzle-CONSPD-3.htm
http://siliconenozzles.com/SPD30-XL-3-Inch-Diameter-Super-Retention-Silicone-Nozzle-SPD30-XL.htm
They both look great, but since I bought mine primarily as a retention nozzle than a plug, I still would have stuck with the original SPD30, so the superb inner ring seal. I'm seriously considering the former as a stretcher, wearable plug and the latter as an enema nozzle, so long as the taper to the neck still provides an ample seal on a large fill. The description says "When masterfully inserted you should be retaining approximately 7.5" of this massive instrument. Its long tapered tip of approximately 4" and 3'' inch maximum diameter will completely fill the rectum thus placing the tip up into the entrance of the sigmoid colon." That is very close to my understanding of my anatomy, which sounds like a fantastic combination of a full rectum sensation, while enabling the enema flow sensations to be focused with the sigmoid region. That sounds like a wonderful combination to me! Does anyone have the SPD30-XL? Whether as an enema nozzle or pure plug, I'm interested to hear.