Instruction: Answer the given question by extracting information from the supporting document.

Input:
Question: what replacement bulb do i need for this product?
Document: I just finished installing one of these on my home in Hawaii where we use rainwater catchment as our water source. I'm happy with both the quality and the price. I doesn't come with filters like many of the other UV units so you do need to add a filter and a pre-filter to the water line before it enters the UV unit. But even after adding two filters the price is still reasonable. The first unit arrived with a broken bulb but Amazon had a replacement to me within four days.
Great product and a great price. I used 3/4&#34; braided hoses to install which was an easy project. Remember you will need electrical power nearby.
The bulb was broken upon receipt and this was not discovered until after the return date. The crystal was very fragile and you must turn it very carefully by hand until it no longer leaks, or it will break. I called Watts and they considered it a shipping issue and referred me back to Amazon. I chatted online with an Amazon rep and she shipped us an entire replacement unit because there are no dealers locally.
There should be warning labels all over it and there isn't.When I tried to install the water system for the second time I knew this time to plumb in a shut off valve with a bypass so that I didn't have to shut off the water to the whole house in case it didn't work the second time or for future repairs or replacement. When I VERY gently put it all together all was well until I slid the bulb into place. The weight of the bulb cracked the crystal.
I failed to open the packages that the quartz glass tube and UV light came in until a plumber arrived today. Bought it on July 13. I missed the 30 day window by 11 days. Amazon can't help me and it seems Watt's does not sell replacement parts online.I can't believe parts are not going to be available since they need to be replaced from time to time.Nearest dealer is 300 miles away.Not sure this was is going to be a good buy.
This product was shipped incomplete and unusable. I have tried to contact the supplier and all to no avail. Do not waste your money on the seller of this product. What a total waste of money. I even asked if I could pay extra to get the missing part and nothing, not even a reply.
It is EXTREMELY thin and fragile.I don't think I would buy this product again, too delicate. The hassle of re-plumbing everything not once but twice and then to have the crystal break again is just not worth it to me. I did re-order another crystal, not much choice at this point. I read the other reviews about it being fragile and thought I would take my chances and really wish I hadn't. *Update: Third times the charm, finally got it installed and working.
The first package arrived damaged and the crystal tube was broken. Unfortunately I had already shut off my water and re-plumbed everything for the UV system, before I discovered the broken crystal. Was able to exchange it quickly and the second one arrived undamaged.The packaging for this is poor. The metal tube that holds everything is heavy and it is shipped in the same box as the bulb and the crystal tube. The only padding on the bulb and the crystal tube is a foam sleeve.
Good price, great shipping response, good condition when received. others talked about damaged but mine was good. if u need bacteria killed this works. had a foreclosure home that needed bacteria killed fro the bank and it worded when water was tested
I bought my Watts 270156 12-GPM 1-Inch 110-Volt UV Disinfection System - less then a year ago and the power adopter is already dead. Try getting a replacement adopter for this unit.. its probably easier to fly to China and buy it directly there. Never buy another WATTS!
Answer: I emailed/called Watts and informed them the model number.  Their phone number is:1-800-752-5582. Their customer service was excellent - when the replacement bulb arrived broken, they replaced it immediately.