Do it Plastic Ballcock Coupling Nut is a 7/8" wing nut style coupling designed for easy installation and reliable performance. Made from durable plastic, this coupling nut comes complete with a rubber cone washer and a brass friction ring, making it i for use with plain end supply tubes. The product is conveniently carded for easy handling and storage. This coupling nut is for plumbing repairs or s where a secure, leak- connection is essential. Model Number: 413895