I LOVE my Sinugator – have been using it for about 3 months. The silicone ring on the underside of the pulsing unit is stretching out and hinders the

I LOVE my Sinugator - have been using it for about 3 months. The silicone ring on the underside of the pulsing unit is stretching out and hinders the ability to screw the pulsing unit onto the blue cup. Is it possible to purchase replacement silicone rings?