LOC-LINE - 1/2" BALL SOCKET IN-LINE VALVE Loc-Line Sale! from 669 /per Qty. Add to Cart This item is currently on backorder but you can still purchase it now and we'll ship as soon as more become available. Loc-Line 1/2" Ball Socket In-line Valve Price per pack of 1 Loc-Line 1/2" Ball Socket In-line Valve - Price per pack of 1. For use with Loc-Line 1/2" modular pipe.