Lifegard Aquatics Standard Threaded Bulkhead Kit for Fish Aquariums – High-Impact Resistant PVC – Includes Bulkhead Fitting, Gasket, Lock Nut – Jet Black – 1-1/2 Inch

Schedule 80 OD is 1.9 inches. Also a 2" flexible couplers fits great on the large thread.They EXACTLY WHAT I WAS LOOKING FOR and the size is great!

This fitting works perfectly for installing 1 1/2" suction and return lines in a wooden hot tub up to 1 1/2 " thick (it could be a bit thicker, but 1 3/4" would be pushing the edge). The price is outstanding as these fittings are hard to find. The inside facing is threaded and works well for adding a screw in skimmer to the suction side. Outside is a slip fit. This unit includes the tightening nut and the inside has a rubberized ridge that functions like a gasket. Great product if you are adding a circulation and/or heating system to a wooden tub.

Total cost effective quality and reliability. Never a leak. Easy assembly on solid tank and with a vinyl liner. I have purchased several for different applications. Never a leak even in long term use. (At least a year maybe closer to two)I recommend this product

These are HUGE😬NOT the same sizing as any the 1.5” pond/water feature, or tubing fittings sold in big box stores.Sadly, I can not use these with anything else I bought (Lowe’s/HD/Hartville Hardware) that is 1.5”😞. I want to return it, but this may/may not be my fault for missing dimensions in the description...TBD.Pay attention to ID/OD dimensions!They are bulky & of good sturdy quality I’d imagine. More like an 1 7/8”😒I haven’t used/put these together w/anything, or dropped them-the threads are slightly rough in spots. You need a strong hand to get the nut off, but I ‘could’ do it by hand w a towel👌🏼

Somehow it's not clear that this bulkhead fitting accepts 1.5" threaded ABS on one side, and 1.5" glued ABS pipe on the other. The end shown with a nut is the GLUE end, the inside of the flange end is THREADED. Glue a pipe on one side, screw a threaded fitting on the other, continue with ABS. The washer has ribs for a better seal on uneven surfaces but won't work on a round tank. Remember 1.5" pipe is INSIDE DIAMETER, the outside of the pipe is larger. That's why this fitting seems so large: 1.5" plus schedule 40 thickness plus the fitting walls plus the flange. The inside of the glue end measures 1-29/32, the flange is 3-13/32, the outer threads (the hole you have to drill) are 2-11/32.There. That answers all the questions I had before I bought it. Just what the doctor ordered for putting a drain pipe through the floor of my trailer. But you're probably buying it for something else!

The media could not be loaded. I HONESTLY don’t know why they call this an 1-1/2” bulkhead. DO NOT BUY THIS if your opening is 1-1/2”. NOTHING about this bulkhead is 1-1/2”. The inside diameter of the internal thread is 1-7/8”. The outside dimension of the bulkhead post is 2-3/8” to the outer thread and 2-1/4 to the thread groove. The lock nut for this bulkhead has an inside diameter of 2-1/4” and a 3-3/8” outside diameter.I returned and bought the size that I need. That being said. These bulkheads are extremely well made and durable. I highly recommend this bulkhead.... IF.... it’s the correct size for your application. But the seller should be more clear about the actual dimensions!!!!

*UPDATE* As I was removing this to replace it with a uniseal, I realized there was a burr trapped under the gasket that was causing it to leak. After doing some surface prep with a box cutter, and tightening it with a pipe wrench I haven't had any issues with leaks. Make sure your seating surface is clean!These are terrible. I put two in the bottom of a 55 gal barrel. Both leaked not matter how hard I tightened them. Gasket material was on the inside so as to provide a better seal. After caulking one of them three times, it finally stopped leaking.The other one will not stop leaking no matter how much caulk I put around it. Don't waste your time. I've ordered uniseals and hopefully those will solve my problem.

Water tight