Features: *Fitment: Compatible for Pentair for Nautilus Plus and for FNS pool and spa D.E. filters ensuring a proper fit and function for your filtration system. *Easy to replace with part number 172855: Designed to replace the part number 172855 making it convenient and hassle-free to install for seamless operation. * stainless steel construction: Crafted from high-quality stainless steel these air vent strainers are built to last resisting corrosion and offering long-lasting performance. *Fine mesh filter for effective filtration: Equipped with a high-quality fine mesh filter these strainers effectively capture debris and impurities enhancing the efficiency of your pool and spa filtration system. *Secure and reliable sealing with high-quality rubber material: Made from premium rubber material these air vent strainers provide excellent sealing performance and strong elasticity ensuring a secure and reliable connection. Specifications: *Product Name: Air Vent Strainers *Material: Stainless steel rubber *Size: 1.75*1.4 inch/44.45*35.56mm *Color: Black+Silver *Replace Part Number: 172855 *Fitment: For Pentair for Nautilus Plus pool and spa D.E. filters. Also for Pentair for FNS pool and spa D.E. filters. *Number of Pieces: 2pcs 4pcs (optional) Package Content: 2/4*Air Vent Strainer Note: 1. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 2. Please allow slight manual measurement deviation for the data.