--- product_id: 384724718 title: "Monument - 1378Z Drain Testing Plug 4 in - MON1378" brand: "monument" price: "529 kr" currency: DKK in_stock: true reviews_count: 5 category: "Monument" url: https://www.desertcart.dk/products/384724718-monument-1378z-drain-testing-plug-4-in-mon1378 store_origin: DK region: Denmark --- # Seals up to 100 PSI pressure Durable flexible rubber membrane 100mm (4 inch) diameter fit Monument - 1378Z Drain Testing Plug 4 in - MON1378 **Brand:** monument **Price:** 529 kr **Availability:** ✅ In Stock ## Summary > 🔧 Seal it tight, work smart — the pro’s choice for flawless drain testing! ## Quick Answers - **What is this?** Monument - 1378Z Drain Testing Plug 4 in - MON1378 by monument - **How much does it cost?** 529 kr with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.dk](https://www.desertcart.dk/products/384724718-monument-1378z-drain-testing-plug-4-in-mon1378) ## Best For - monument enthusiasts ## Why This Product - Trusted monument brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Built to Last:** Durable rubber construction resists rust and wear, perfect for repeated use. - • **Compact & Lightweight:** At just 120g and small dimensions, it’s portable for on-the-go professionals. - • **Effortless Installation:** Wing nut activation expands the rubber membrane for a secure, waterproof lock. - • **Pressure-Resistant Seal:** Withstands up to 100 PSI, ensuring leak-proof confidence on every job. - • **Precision Fit for 4-Inch Pipes:** Engineered to snugly seal standard 100mm drain pipes with ease. ## Overview The Monument 1378Z Drain Testing Plug is a high-quality, flexible rubber plug designed for 4-inch (100mm) drain pipes. It features a wing nut mechanism that expands a rubber membrane to create a waterproof seal capable of withstanding pressures up to 100 PSI. Lightweight and durable, this plug is ideal for plumbing professionals seeking reliable, rust-resistant equipment for efficient drain testing and maintenance. ## Description The Monument test plugs are durable, quality flexible drain plug for pluging drains and pipes. This plug is easy to use and comes in 3 and 4 inch versions. These plugs are simply inserted into the pipe end that is just being repaired or replaced and simply turn on the wing nut button, this will press the rubber membrane, which makes it expand to pipe or hose with one end waterproof seal seal. P>For shutting off drain pipes used cars P>Equipped with removable top cover caps and rubber rings. P>They are capable of sealing against pressures of up to 100PSI -.. 7. Bar p>Diameter: 100 mm. 4 inches. p> Review: These are perfect and do not rust over time Review: M'a permis d'obturer parfaitement et simplement un tuyau d'évacuation en fonte de 80mm ## Features - Model Number: MON1378 - Box contents: 1 piece - Package weight: 100g - Package dimensions (L x W x H) in cm: 12.2 x 10.6 x 10.8 cm ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0001P0F22 | | ASIN | B0001P0F22 | | Batteries Included? | No | | Batteries Required? | No | | Best Sellers Rank | #134,482 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #44 in Plumbing Testing Equipment | | Color | multi-coloured | | Customer Reviews | 3.9 3.9 out of 5 stars (66) | | Customer reviews | 3.9 3.9 out of 5 stars (66) | | Date First Available | 7 August 2012 | | Date First Available | 7 August 2012 | | Included components | 1 x MON1378 | | Item Package Quantity | 1 | | Item Weight | 120 g | | Item model number | MON1378 | | Item model number | MON1378 | | Manufacturer | Monument | | Manufacturer | Monument | | Material | Rubber | | Part number | MON1378 | | Power source type | AC | | Product Dimensions | 8.51 x 9.5 x 9.5 cm; 120 g | | Product Dimensions | 8.51 x 9.5 x 9.5 cm; 120 g | | Size | 100 mm | ## Images ![Monument - 1378Z Drain Testing Plug 4 in - MON1378 - Image 1](https://m.media-amazon.com/images/I/61AgfbW+vXL.jpg) ![Monument - 1378Z Drain Testing Plug 4 in - MON1378 - Image 2](https://m.media-amazon.com/images/I/61966ZKuc0L.jpg) ![Monument - 1378Z Drain Testing Plug 4 in - MON1378 - Image 3](https://m.media-amazon.com/images/I/6137sKArvNL.jpg) ![Monument - 1378Z Drain Testing Plug 4 in - MON1378 - Image 4](https://m.media-amazon.com/images/I/21Tt9K48O-L.jpg) ## Available Options This product comes in different **Size** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Review *by M***N on 2 August 2025* These are perfect and do not rust over time ### ⭐⭐⭐⭐⭐ Review *by M***. on 5 October 2022* M'a permis d'obturer parfaitement et simplement un tuyau d'évacuation en fonte de 80mm ### ⭐⭐⭐⭐⭐ Review *by I***L on 5 November 2022* Good product good value ## Frequently Bought Together - Monument 4in.100mm X ½in. Nylon Drain Testing Plug - MON1378Z - Monument 3in. 75mm X ½in. Nylon Drain Plug - MON1377W - Monument MON1376 Drain Test Plug 50mm (2in) --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.dk/products/384724718-monument-1378z-drain-testing-plug-4-in-mon1378](https://www.desertcart.dk/products/384724718-monument-1378z-drain-testing-plug-4-in-mon1378) --- *Product available on Desertcart Denmark* *Store origin: DK* *Last updated: 2026-04-23*