This product from AQUA-AGRO is designed to simplify Irrigation fitting for farmers and novices with zero knowledge of drip and sprinkler irrigation network and installation. This product comes with 1/2" (M-THD) which can be connected to 1/2" (20mm) PVC pipe with help of regular pvc female threaded adaptor (FAPT). This creates an easy connecting 16mm Barbed outlet drip adaptor from pvc pipe 1/2" (20mm) for irrigation in farm and garden. Although plastic is UV stabilised. we recommend to protect it from shade or sunlight or paint it with enamel / oil paint to enhance its life