--- product_id: 6074143 title: "4'' UNISEAL Flexible Tank Adapter (Bulkhead)" brand: "the uniseal warehouse" price: "€ 21.06" currency: EUR in_stock: true reviews_count: 8 url: https://www.desertcart.de/products/6074143-4-uniseal-flexible-tank-adapter-bulkhead store_origin: DE region: Germany --- # 4.5" Pipe OD 5" Holesaw Size Made in USA 4'' UNISEAL Flexible Tank Adapter (Bulkhead) **Brand:** the uniseal warehouse **Price:** € 21.06 **Availability:** βœ… In Stock ## Summary > πŸ”— Connect with Confidence! ## Quick Answers - **What is this?** 4'' UNISEAL Flexible Tank Adapter (Bulkhead) by the uniseal warehouse - **How much does it cost?** € 21.06 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.de](https://www.desertcart.de/products/6074143-4-uniseal-flexible-tank-adapter-bulkhead) ## Best For - the uniseal warehouse enthusiasts ## Why This Product - Trusted the uniseal warehouse brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Robust Design:** Supports wall thickness up to 3/8" for durability. - β€’ **Quality Assurance:** Crafted in the USA for reliability and performance. - β€’ **Seamless Integration:** Easily adapts to various tank setups. - β€’ **Precision Engineering:** Perfectly sized for a 5" holesaw, ensuring a snug fit. - β€’ **Versatile Application:** Ideal for both residential and commercial tanks. ## Overview The 4'' UNISEAL Flexible Tank Adapter is a high-quality, USA-made solution designed for seamless integration into various tank systems. With a pipe outer diameter of 4.5" and a recommended holesaw size of 5", it accommodates wall thicknesses up to 3/8", ensuring a robust and reliable connection for both residential and commercial applications. ## Description 4" UNISEAL Uniseals are used to attach pipe to just about any container in situation where bulkheads will not work.The most common use is on curved surfaces such as storage drums, buckets, and even other pipe.4" Uniseal Specs:Pipe ID - 4" (100mm)Pipe OD - 4.5" (114mm)Holesaw size: 5" (127mm)Up to 3/8" Wall Thickness.Made in the USA ## Features - Made in the USA - Pipe OD - 4.5" (114mm) - Holesaw size: 5" (127mm) - Up to 3/8" Wall Thickness. ## Product Details - **Size:** 127 mm - **Material:** Sarlink 4165 - **Brand:** The Uniseal Warehouse - **Color:** Black - **Item dimensions L x W x H:** 5.72 x 5.72 x 0.72 inches - **Connector Type:** Adapter - **Thread Size:** 4 inch - **Number of Pieces:** 1 - **Manufacturer:** The Uniseal Warehouse - **UPC:** 799475705816 ## Images ![4'' UNISEAL Flexible Tank Adapter (Bulkhead) - Image 1](https://m.media-amazon.com/images/I/61j-nctOE8L.jpg) ## Questions & Answers **Q: Is this designed for a pipe with a 4.5" od, or a 4" od?** A: It made to fit SCH 40 PVC Pipe which has an OD of 4.5" and an ID of 4". PVC pipe is sold by its inside dimension. Uniseals are labeled for the size pipe they fit. In this case 4" pvc. **Q: What material is the seal made of? is it polyethylene or polypropylene and does it meet fda guidelines for potable water?** A: It is made from Alcryn 2070. **Q: Will this work with 4" sewer pipe? it has an od of 4.2" instead of the 4.5" od of schedule 40.** A: 4.2 = approximately 4.016" there is slight gap 4.5=approximately 4.0375" see if there is a bell reducer. or a flex coupling **Q: hola, de cuantas pulgadas o milimetros tiene que ser el hueco en el tanque ?** A: El hueco para el uneseal tiene que ser del tamaΓ±o de la parte gruesa ## Customer Reviews ### ⭐⭐⭐⭐⭐ Great product *by M***H on February 2, 2025* Worked great on a septic tank. You drill a 5" hole with a holesaw (highly recommended you do it this way) and put the seal in the hole from outside the tank. Then you lube your pipe up (I used glycerin because I had some handy) and push the pipe in from the outside. It helps to spin and wiggle as you push it in. Based on how hard it was to get the pipe in there, I have no doubt it will seal.It is designed for pipe with an outside diameter of 4.5". That includes 4" ABS pipe and 4" schedule 40 PVC pipe.For low-pressure applications, you may also encounter SDR35 PVC pipe. I am not confident this would seal on SDR35 because it has a slightly smaller outside diameter. The same company makes an SDR35 seal, but I couldn't find it on amazon. This is why I opted to use schedule 40 pipe instead. SDR35 is used in low-pressure applications, and around where I live, it is often used in septic systems on the tank outflow side. Just make sure you know what kind of pipe you are buying and make sure it matches your seal. ### ⭐⭐⭐⭐⭐ use lots of greese to install *by J***G on April 27, 2024* i used them on a fiberglass septic tank. the holes in the tank were already cut to the right size. the seals installed right in the the tank holes. i tapered the end of the 4" abs pipe and used silicone sealant as a lube all over the entire length of inserted pipe . it took force and wiggling to to get the pipe started but once it started it slid in easy . The septic tank hole was at an slight upward angle but this was not enough to create a problem. ### ⭐⭐⭐⭐⭐ I've used Uniseals for over 20 years, never a failure *by J***N on June 26, 2022* Uniseals are an inexpensive and effective solution to putting round pipe into other pipes, barrels, square sumps, round sumps, and square tanks, but they do have limitations. Follow the guidelines about size differences: you can't put a 3" uniseal into a 4" pipe. I've put in over 100 of these over the years, never a failure when I followed the rules (and including a few times when we didn't..... that's farmers for you.)Hints: When using larger diameter uniseals, use schedule 40 pipe, and chamfer the edge generously. You want to have a nice, SMOOTH, taper on the end of the pipe to slide into the seal, Thicker pipe allows for a longer taper, which makes it MUCH easier to slip through. I generally use a grinder with a flap disc to create the taper.Use good lube (my favorite is Crisco because it doesn't wash away in water like soap). Lots of it.Use a good hole saw. The whole needs to be EXACTLY one inch larger than the seal. A jig saw won't do.When pushing into a tank or other medium that will flex, support the back VERY well. Make sure your taper is generous, very smooth, use lots of lube, and then wiggle and push. It will take some force, especially on the larger diameters (4" and 6", particularly). ## Frequently Bought Together - 4'' UNISEAL Flexible Tank Adapter (Bulkhead) - 2" Uniseal Flexible Tank Adapter - Perfect for Attaching 2-inch pipe to Curved Surfaces, Storage Drums, Buckets, and More - Ideal for Situations Where Bulkheads Fail - 2 Pack - 3'' UNISEAL Flexible Tank Adapter (bulkhead) --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.de/products/6074143-4-uniseal-flexible-tank-adapter-bulkhead](https://www.desertcart.de/products/6074143-4-uniseal-flexible-tank-adapter-bulkhead) --- *Product available on Desertcart Germany* *Store origin: DE* *Last updated: 2026-04-24*