The valves are 1/4 inch male/female, full port. The "T" type handle must have two 3/32 inch diameter holes drilled through. These valves will be torqued to 30 foot/pounds. The valves will be holding low pressure gas,10 PSI to 40 PSI. The weight of the valve we are currently using is 70.2grams. We do not have a drawing on this part, but I am attaching some pictures. We use 4000 to 60000 of these valves per year. We will need 5 to 10 sample valves for evaluation. After approving samples, we will place an initial order for 1000 valves. We also use 1.5 inch female/female valves, Approximately 5000 per year. If we approve a 1/4 inch valve, we would then pursue the 1.5 inch valve.