Single balloon

My two girls (women) have expressed a desire for a balloon type nozzle.

Most commonly, they'll position their rear end at the end of our massage table, with me standing between/holding their legs. We dug out an older, inexpensive single balloon that uses a semi-rigid plastic nozzle and a plastic balloon, tube, and inflator cuff. The inexpensive version worked perfectly, perhaps because the weight of the nozzzle/hose (We use long surgical tubing on the bags, and suspend from an IV pole.) The only issue is the age of the plastic tubing, making it necessary to add a little air. So, I'm nozzle shopping.

I've found a latex single balloon nozzle that appears to be of the same quality of the double for half the price, and would rather spend the extra money on other sex toys....

I know I'll get votes on the double balloon, but besides cost, the intended use is an issue. My wife's enema preference is to have intercourse while receiving. A big balloon inflated between us would seem an obstruction.

I'm wondering if anyone who has used the single inflatable nozzle could comment on it's effectiveness?

I have had a single baloon nozzle which I obtained from a medical supply company many years ago. It has lasted amazingly well and generally worked well preventing leakage. However, I have found on occasion, if I inadvertently contracted my anal muscles, the nozzle could push back inside slightly allowing some leakage. If the recepient's muscles stay relaxed and/or the nozzle stays in place by weight of the hose or something holding it tightly against the anal opening, this should not occur. I have recently replaced mine with a double baloon nozzle which I am looking forward to trying.

I have used a single balloon nozzle for a few years now. It's a 500/750 so I really need to be stretched back there first, before I can completely accommodate the thing. (Should be lots of fun for your girls.) I got it from Twist My Rubber Arm. I think it was $40. They have quite a large selection of inflatable nozzles and their prices are very reasonable.

We found a plastic nozzle with a 1 7/8" bulbous head, and it's great for retention..

I have tried both. The single balloon nozzle prevents me from leaking just as well as the double. However, the double gives a much "tighter" feeling - feels like a much better seal. It's a lot more erotic. I only use the double now.