The Zurn Wilkins 860XLFT Resilient Seated Ball Type Test Cock with SAE Flare Fittings is installed on backflow preventers as a test port for attaching a differential pressure gauge. The RK14-860XLFT is a standard test cock repair kit containing four 1/4" test cocks with SAE flare fittings compatible with 1-1/4" - 2" backflow preventers.