This part fits on 6" steel frames. It is used on the bottom of the pool. This style of joint utilizes a 5/8 inch rail (or track). It measures 4" 1/4" wide and 2" 3/4" deep. Be aware, that older pools (2010 & older) use steel joints. This resin joint is interchangeable with steel joint (part #2167 instead of the lower joint of the pool) if you wish. Resin joints have an advantage because they are corrosion resistant. Steel joints have an advantage because they can bend without cracking. If you need a resin upper joint, you should find part # 2168. | 
