1.About price:
The price is best price according to your quantity,but all is negotiable,it can be changed to your quantity,when you are making an inquiry,please let us know quantity you want.

2.About sample:
Free sample will be provide with you to test quality,for the shipping cost is collect or you pay us the cost in advance

3.About MOQ:
Different products with different MOQ,for example
Cylinder:5pcs for standard size
Valve:5pcs
FRL unit:5pcs
Fitting:100pcs
Tube:1rol for normal size/color

4:About quality
All products 100% test be shipment,the quality warranty is 12months

5:About Payment 
Payment accept T/T,Western union or Paypal.
For bigger order 30% deposit start mass production,70% balance aganist packing list
For small order,need 100% payment before production.