Gas Capacity: 3.0cu ft/85liters, Capacity: 0.5L, Length: 350mm, Color: Yellow / Green / Black, Life Span: Resistant to sea water corrosion for over 500hrs., Water Volume: 26.62cu.in/0.42liters, Material: Aluminum Alloy+ Silicone, Surface Processing: Hard Anodizing & Spraying Treatment, Pressure: 3000PSI / 200bar / 20MPa, Breathing Number: 170times(0.5 Liters each time), Diameter: 59mm.
Basically copy coupon, view price history or create e-mail price alert. What is best price?
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
Click here to search by yourself. Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in Europe 
. So I have checked for active coupons (all category coupons and old ones), but there was no working coupon in Banggood. I don’t really know if this price is reasonable, coz there’s no price history in my DB.
Link: Banggood product page
Price: $-3
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BGDIVING1, BGTOPSALE1, BGdragonBoat, bGhOnEy10, BGUJDO, bgshOOp10, BGSJKK5, BGSSMN1, BgoFErTaSchInA10, BGOW11, BGC15, BGSHHA, BGCZSDDW, BGEUOD1, FIND16270, 96ca70, BGDDD2, BG20PCS, BG83675c, BGwhielabel, BGP7726, BG7704, BGissamd4, 7bcdf9, BG516f0c, BG10OFFAFF1, BGDN205, BG4d9120, BGa9f453, BGAlerabatod, BGe44f95, 00c906, BG2d8923, BG00c906, BGe46870, BG09218e, BG4affd5, BG4e10f8, BG5ea898, MVC8SPRING, 8BGwbg2204, BG369949, BGfc8a9a, BGPL109B, BG310033, BG92f30b, BGa9b608, BGa61f2e, BGcb674d, BG12c77e, DealBGimpact, Cuponation9, BG21b559, BGissam167, BGissam15wts, BG8OFFCOUPON, TTBLACK5, BG589b2e
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. China – 2x 0.5L Scuba Oxygen Cylinder Diving Set ($-3)
Price history and price alert
Not enough data to show price history chart… $139.99 is the only recorded price. It was not cheaper than that since we have saved it in DB.
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).