Current Culture Under Current UC Spin Tight Bulkhead is great for recirculating deep water culture hydroponic systems. Creates a secure, water tight seal around the Under Current growth modules. The unique design requires no tools and reduces stress on growth module side walls extending the module life. The UV stabilized, heavy duty ABS construction provides years of use and is recyclable. Fits all schedule 2 in & 3in ABS/PVC pipe and is suitable for DIY hydroponic applications. Made in California. Comes standard with all Under Current® systems, UC manifolds and joints.