Product Description Please note NEO & NEO Plus series use different accessories. The Cold Water T-Adapter helps connect the Cold Water Bidet Hose to your toilet tank's fill valve. The 7/8" size is included with your NEO or NEO Plus bidet kit. Two alternative sizes are also available depending on your fill valve. 7/8" T-Adapter: Use when your fill valve is the standard North American connection size of 7/8". 1/2" T-Adapter: Use when your fill valve is 1/2" — a common size for plumbing outside of North America and RV toilets. NEO Series only. Available in metal and plastic. 3/8" ALL T-Adapter: Use when you have a standard North American supply valve size of 3/8" and prefer a Metal Bidet Hose over plastic. PAIR WITH — 7/8" T-Adapter: NEO Series Metal Cold Water Bidet Hoses (1/2" x 1/4") NEO Plus Series Metal Cold Water Bidet Hoses (3/8" x 3/8") PAIR WITH — 1/2" T-Adapter: NEO Series Metal Cold Water Bidet Hose (1/2" x 1/4") PAIR WITH — 3/8" ALL T-Adapter: NEO Series Metal Bidet Hoses (3/8" x 1/4") NEO Plus Series Metal Bidet Hoses (3/8" x 3/8") How To Connect 7/8" T-ADAPTER — NEO SERIES: TOP Attaches to the toilet tank's 7/8" fill valve BOTTOM Attaches to your toilet's original water supply hose SIDE Attaches to the 1/2" end of the Cold Water Bidet Hose (1/2" x 1/4") 7/8" T-ADAPTER — NEO PLUS SERIES: TOP Attaches to the toilet tank's 7/8" fill valve BOTTOM Attaches to your toilet's original water supply hose SIDE Attaches to the 3/8" mesh filter end of the Cold Water Bidet Hose (3/8" x 3/8") 1/2" T-ADAPTER — NEO SERIES: TOP Attaches to the toilet tank's 1/2" fill valve BOTTOM Attaches to your toilet's original water supply hose SIDE Attaches to the 1/2" end of the Cold Water Bidet Hose (1/2" x 1/4") 3/8" ALL T-ADAPTER — NEO SERIES: TOP Attaches to your toilet or sink's original water supply hose BOTTOM Attaches to the toilet or sink's 3/8" supply valve SIDE Attaches to the Metal Bidet Hose, the 3/8" end 3/8" ALL T-ADAPTER — NEO PLUS SERIES: TOP Attaches to your toilet or sink's original water supply hose BOTTOM Attaches to the toilet or sink's 3/8" supply valve SIDE Attaches to the Metal Bidet Hose, the 3/8" end