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.
Just check coupons out (with price alert and history). 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 code price check (UTC time):
Banggood
Banggood warehouse is located in Europe 
. Too bad there’s no coupon right now 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: $-3
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/i1u
Old coupons (from the oldest to the newest): BGDIVING1, BGTOPSALE1, BGdragonBoat, bGhOnEy10, BGUJDO, bgshOOp10, BGSJKK5, BGSSMN1, BgoFErTaSchInA10, BGOW11, BGC15, BGSHHA, BGCZSDDW, BGEUOD1, FIND16270, 96ca70, BGDDD2, BG20PCS, BG83675c, BGwhielabel, BGP7726, BG7704, BGissamd4, 7bcdf9, BG516f0c, BG10OFFAFF1, BGDN205, BG4d9120, BGa9f453, BGAlerabatod, BGe44f95, 00c906, BG2d8923, BG00c906, BGe46870, BG09218e, BG4affd5, BG4e10f8, BG5ea898, MVC8SPRING, 8BGwbg2204, BG369949, BGfc8a9a, BGPL109B, BG310033, BG92f30b, BGa9b608, BGa61f2e, BGcb674d, BG12c77e, DealBGimpact, Cuponation9, BG21b559, BGissam167, BGissam15wts, BG8OFFCOUPON, TTBLACK5, BG589b2e
(these codes were not working in latest coupon update, but you can check them out anyway)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. China – 2x 0.5L Scuba Oxygen Cylinder Diving Set ($-3)
Price history and price alert
Price history is not available for this item (not enough database records)! The lowest price was $139.99 though.
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)).