Description: 【Material】Made of aluminum alloy and copper, scuba tank refill adapter with gauge and hose is designed to withstand heavy use and last for years. Its sturdy construction ensures it can handle up to 6000 psi pressure. 【Two Types of Threads】DIN valve has two types of external thread. Sizes: M18x1.5, or 5/8-18UNF. please check your tank thread before purchasing. 【Complete Set】Scuba Adapter with gauge and 50cm hose, with 8mm female quick disconnect adapter that allows to be connected and released from other male fittings within seconds. 【Double Gauges Design】Double pressure gauges indicate tank pressure, and inline pressure. WIth 50.8cm long stainless steel spring protection hose. 【Strong Compatibility】 Mainly used for SCBA gas cylinders, SCUBA diving cylinders or PCP gas cylinders, easy to assemble and install. Specification: Material: Aluminum Alloy, Copper Thread A: 5-8 18UNF Or Thread B: M18x1.5 Size Chart: 50.8cm/20.00inch Package Includes: 1 Set High Pressure Spring Hose Scuba Adapter with Gauge ( Thread A or Thread B, as you choose) Note: Please allow slightly errors 1-2cm differences due to manual measurement.