Tank Adapter Drilled Thru (No Stop) Product Specification Part No. Tube Size Male NPTF Thread 11316 1/4 1/8 11317 1/4 1/4 11318 3/8 1/4 11319 3/8 3/8 11320 3/8 1/2 11321 1/2 3/8 11322 1/2 1/2 11323 5/8 1/2