Hydro Pressure Cannon is a Equip Spell Card.
Spell Cards are usually activated from the hand on your turn unless their type gives another timing window.
On the current TCG and OCG Forbidden & Limited lists tracked here, Hydro Pressure Cannon is Unlimited.
YGOPRODeck lists Hydro Pressure Cannon for these formats: Duel Links, Common Charity, Edison, TCG, OCG, Master Duel.
A listed print of Hydro Pressure Cannon appears in Ancient Prophecy (ANPR-EN055) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for Hydro Pressure Cannon is about $0.03 on Cardmarket (prices change frequently).
