This Bass drip proof valve is spring loaded and will not drip at zero water pressure. With a stainless steel stem for longer life. Each component is machined to strict tolerances for trouble-free operation. Neoprene O-ring seal assures positive drip control. Unique retainer plug allows easy disassembly for cleaning. Standard 1/8" NPT body thread for installation directly into pipe or use with our No. PPS PVC pipe saddle or our No. PPT pipe saddle tee for 1/2" PVC pipe. Can also be adapted for use with 3/16" black tube systems by ordering adaptor No. DD-TA.