The Ninja Carbon Fiber Superlite Tank SLP (77/4500) Gunsmoke Grey color includes a PRO V2 SLP regulator for use in airsoft HPA tapped guns. The 77/4500 is a large custom super light air tank made! The SL Super Light tanks weigh much less than other air tanks on the market. The tank includes a PRO V2 SLP output regulator pushing up to 300 PSI. This is perfect for all Wolverine and Polarstar systems (not for use with Tippmann). High quality made from Ninja.