Size: 38 mm Overview This 38 mm pool plug is a screwin tube plug designed to protect pool plumbing during winter and to isolate lines during equipment maintenance. The plug is available as a single black plug in a choice of six sizes: 25 mm, 32 mm, 38 mm, 45 mm, 51 mm, and 63 mm. Choose the 38 mm option for compatible 38 mm openings. Key benefits Protects plumbing from winter damage: blocks pipes to reduce the risk of water entering and freezing inside lines. Stops water loss during maintenance: isolates and drain ports while pumps, filters, or other equipment are serviced. Secure, longlasting fit: constructed from stainless components and PVC with expandable rubber sealing to deliver a firm, non slipping fit that resists cold and shrinkage. Easy to install and remove: screw into the port to expand the seal and hold the plug in place without extra tools. Features and specifications Size: 38 mm (this listing) Material: stainless and PVC with expandable rubber sealing Finish: black Quantity: 1 plug per , other sizes available on request Practical use scenarios Winterizing a residential pool: install the 38 mm plug in lines to help keep water out of pipes before temperatures drop. Equipment maintenance: isolate a or drain port to prevent outflow while replacing a pump or servicing the filter. Seasonal closures: plug off unused lines during pool closing to reduce the chance of debris or insects entering plumbing. Compatibility and performance Intended for use as a tube plug or /drain port stopper in swimming pool systems that fit a 38 mm plug. The combination of stainless, PVC, and expandable rubber provides stable performance in cold conditions and repeated use. Installation tips Clean the port before installation to ensure a tight seal. Screw the plug in until the rubber expands and the plug sits firmly without wobble. Remove by unscrewing and pulling straight out. Store in a dry place when not in use. This 38 mm pool plug offers a practical, durable solution for protecting pool plumbing and isolating lines during maintenance. Select the correct size to ensure reliable sealing and long service life.