Why Choose GX pump? 1, GX PUMP is a brand dedicated to the PCP field for more than 20 years and has a number of invention patents, especially compression methods and structures. Every professional airguner hopes to have a reliable compressor, not a cheap one with a short life.2. Compared with other cheap ones in the market, Our pump fills a 0.5 liter bottle, 0-30mpa is stable for about 18 minutes. But the competitor is 25 minutes for the first time, 30 minutes after several times, and over 40 minutes after 10-20 times using.3, Ours can be used continuously for about 30-40 minutes. The cheap one is that you have to stop and reduce the temperature for 10-20 minutes. Although it is air-cooled, because their high-pressure pipe is designed inside the machine, the wind cannot blow into the high-temperature area, unless Cool with water. We have exclusive design patent for the compression method , Patent No: US 9,726,165 B2 .Please consider carefully when selling such productsWith the 8mm quick connector, you can also inflate your diving bottle less 1.5L（does not include scuba adapters and air filter for breathing )Note: New version does not include grease syringe any more. You can buy common food grade grease to repack ( when speed dropped a lot and can not solve after cleaned the bottom check valve )Package include:Machine *1, Instruction manual *1, Fitting kit *1, Switching Mode Power Supply*1Note: CS2 and CS3 series have same motor and patent design for the compression structure. Comparing with CS1 version, they have better performance and lifespan. Specifications Voltage: DC 12V for car battery, or AC 110V-220V for home outlet Inflating speed: 2700R/min cable length Ac cable :1.5m, DC cable : 2.35m. Cooling system: Built-in fan cooling Shut down: Auto stope at setting pressure Niose: 75DB Lubrication Mode: added food-grade grease before factory. Don't add more if filling speed is normal , otherwise will cause bad working. Output nut: M10*1 , Quick connector: 8mm Power: 250W Net weight: 7.5kg Common problem and solution:1. The pressure can not increase to a desired valuePls check leaking on the bleed valve , burst disc, safety valve and moisture filter tube . Bleed valve and moisture tube leaking means you need to check if the bleed valve lost the inner steel ball. Burst disc leaking can be solved by replaced a new disc. Safety valve can also be tighten. There are teaching videos on youtube.2.The working speed dropped After checked for no leaking, you need to clean the bottom check valve . pls search how to clean CS3 check valve on youtube. If still can not solve, you can add/repack grease into the cylinder. GX-E-CS2 pcp compressor GX-E-CS3 pcp compressor GX pcp hand pump GX-E-5K2 pcp compressor GX-E-L2 18V cordless pcp compressor Add to Cart Add to Cart Add to Cart Add to Cart Add to Cart Customer Reviews 4.3 out of 5 stars 1,389 4.4 out of 5 stars 1,082 4.3 out of 5 stars 423 4.7 out of 5 stars 33 4.2 out of 5 stars 83 Price $299.99$299.99 $379.99$379.99 $129.99$129.99 $1,799.99$1,799.99 $359.99$359.99 Power source 110V ac or 12V car battery 110V ac or 12V car battery no data 110V ac only 18V Lithium battery power 250W 250W manual 1200W 250W Stop way manually auto stop no data two stage setting auto shutoff pressure manually max pressure 4500psi/30mpa 4500psi/30mpa 4500psi/30mpa 4500psi/30mpa 4500psi/30mpa lubrication grease (no need to add in future if filling speed is normal) grease (no need to add in future if filling speed is normal) grease gease ( add after used up if filling speed is normal) grease (no need to add in future if filling speed is normal) cooling way fans fans no data water+fans fans Max filling tank size only suggest less 0.7L pcp tank only suggest less 1L pcp tank only suggest less 0.5L pcp tank can fill over 20L hpa only suggest less 0.7L pcp tank continuous working time suggest 30-40 minutes work/stop cooling cycle suggest 30-50 minutes work/stop cooling cycle no data 600 minutes max suggest 30 minutes work/stop cooling cycle Weight 6.7KG 7.5KG 3.1kg 48KG 7.6kg with battery Oil-moisture filter included extra black filter to install Built-in filter external blue filter and built-in built-in industry class filter Built-in filter